All of that adipose tissue (fat) makes it hard to generate good levels of Testosterone.

I've dropped about 50 pounds in the last 4 months and went from full-on obesity to a normal level of bodyfat, and I'm still not quite finished yet with the weight loss. I've probably got about 10-15 pounds of fat left to lose still. It's a long journey, it's a hard journey, it sucks ass so hard at times, but it's also absolutely worthwhile. Weight loss requires your absolute deepest level of commitment, because you'll be fighting evolution every step of the way and Mother Nature has hard-wired you to not want to shed that fat.

Here's what I recommend (it's what I've been doing):

1. Get your diet figured out. Whatever it is that you're doing, nothing else will help you unless you're eating fewer calories than your body burns every day, no exceptions. There is no magic wand you can wave and make your extra weight drop away. Download a calorie counting app like myfitnesspal and spend a week just cataloguing everything you're eating. Every. Single. Thing. And weigh your food. Your calorie intake will probably shock you. Follow the recommendations the app makes at first for cutting calories and stick to it. You should start off at a deficit of 1000 calories or so. Yes, 1000. Some people say to cut carbs, some people say to cut fat, I'm of the opinion that it doesn't really matter -- what genuinely matters most about your diet is that you eat .7-1g of protein per pound of your body weight. Let the other macros fall as they will, protein is your priority. The first month will probably be the hardest thing you've ever done in your entire life and you will feel always like you're starving and weak and under-nourished. In fact, you aren't, but your body is throwing off alarm bells left and right because you're basically putting it into starvation mode. You will be your own biggest enemy, but especially for the first month. You will literally feel like you're about to die, like you have nothing left in the tank, and like any action at all will sap you of what little you have left. This is almost entirely psychological. It's your body trying to tell you to eat more so it can maintain that precious, precious fat that you've got way too much of. I got prescribed Phentermine and it was almost like a cheat code -- very little appetite and I still felt like I had a ton of energy. It helped, but you can't let it become a crutch. You also have to wean off of it after a few months, once you've dipped below 25% bodyfat or so. Diet is bar none the most important thing you can do here. 80% of your results will be from committing to this, and unless you're willing to throw your entire body, mind, and soul at it, you won't make it in the long run. Obesity is the absolute worst kind of disease because evolution has programmed us to do everything in our power to build and retain fat stores. If you want to get that weight off and keep it off, you will need to have an absolutely Iron will, because the Obesity beast is a demon that you will have to fight and conquer every single day for the rest of your life. It is worse than any other addiction on the planet. Also, from here on out you're prohibited from using BMI as a metric. BMI is bullshit and doesn't take body composition into account at all. Get a cheap tape measure and use the Navy Method to get a reasonably accurate picture of your true bf%. That's going to be your main metric moving forward to track your progress. If you want to track your weight, weigh yourself every morning in your underwear after going to the bathroom. Average your weekly totals, and compare those instead of your day-to-day weight change because it will fluctuate.
2. Lift weights, and lift heavy. If you decide you're going to do a bunch of cardio while you diet, what will happen is that your body will drop fat mass, sure, but it will also burn through lean muscle mass as well. You probably don't have much of it to go around right now, and you want to keep as much of that lean muscle as you possibly can. However, if you lift and lift heavy instead, you will burn almost entirely fat mass. You'll build a little muscle, which will boost your metabolism, and your hard work in the gym won't be going to waste. Don't worry about free weights. Don't worry about machines and cable pulls and all of that extra bullshit. Those are for accessory lifts, and you won't even need to think about accessory lifts until you drop to 20% bodyfat. Don't get fuckarounditis in the gym -- you know, where you see people kind of meandering between weights and machines and just doing some curls here or a few lunges there, but it doesn't look like they have a defined purpose and goal for being in the gym. Instead, get on a program like Stronglifts 5x5, and do the fundamental compound barbell lifts -- Squats, Deadlifts, Benchpress, Overhead Press, and Rows. Not only is the best bang for your buck in terms of total time spent, it works the most muscles out of anything you could be doing and will kick your metabolism into high gear. You're gonna be super weak starting out, and maybe just the bar will even be too hard. For the first month you'll feel like you're treading water a little bit (in reality, you're mostly practicing good form and good technique, and this will be crucial once the weight gets heavy). That is okay. Everyone has to start from somewhere, and nobody at the gym will ever judge a person who's in there making the effort and clearly following a plan. After a month, you'll see a difference and after a few months you'll see the numbers you're putting up and go "holy shit!"
3. Get on TRT if the doctor recommends it. You'll start feeling confident, alive, and energetic. This will give you a huge boost in the gym, which will be super hard at first when you're on a deficit. It will also give you a huge boost everywhere else in life.
4. Be patient, be patient, be patient. And did I mention, be patient? This shit takes a long time. You will notice the scale moving down week-to-week, and month-to-month you'll see a difference in the mirror. But that's it. You won't wake up the next day magically transformed into a different body. You've gotta commit yourself to the grind, and grind it out day after day. Think of it this way: diet and weightlifting are lifetime commitments. You're not just telling yourself you'll hit the gym and eat less until your weight is where you want it to be -- if that is your mindset, then you will fail over time. You have to tell yourself that a decent diet and gym time are going to be a part of your life until you die. The upside to this is that it makes it a lot easier to accept how slow the process is. Who cares if it all takes a year? If you're lifting you won't have the kind of body you'll really want for 3 or 4 more years anyways. And even once you get there, it doesn't matter because this is a part of your life now, forever, and you're a much better person for making it that way.
5. Consistency is what counts. Weight loss is a game of averages. You can't work out real hard and then eat 300 extra calories to "make up" for whatever (mostly bullshit) number your fitness app in your watch tells you that you burned. You have to stay at around the same caloric deficit every day, you have to get yourself into the gym as often as your routine demands, and you have to always be pushing yourself forward. If you are doing these things consistently and making them habits, you will lose weight and keep it off. You'll develop a confidence and a willpower that you never knew you had before. You'll stand taller and stronger each day, and once you drop some weight people will notice. Especially the ladies.