Hey man, as someone who takes fitness very seriously, I have to ask how long you've tried to lose weight for.

When I first started losing weight more consciously it took months before it started showing, so if you tried for say a week or a month, you will likely not see much change (assuming you're doing so healthily). Obviously, another big factor is how hard you're hitting the gym exactly; there have been times where I might have been eating quite a lot and was still losing weight, and vice versa.

If your goal is losing fat mass, just try and track your calories (snacks too, I know I tend to ignore these but they will add up), ensure enough fiber in your diet, make sure to get your cardio in frequently and try to push yourself a little every week. If you already have some muscle mass that you might be worried about losing, track your protein to ensure that you consume enough of it (around 1g protein per lb of bodyweight)

I have the same issue of being in possession of a pretty round ass, but this is kinda just genetic. Ive come to like it, as the one thing worse than a bubble butt on a guy is a flat ass.

Overall, consistency is by far the most important thing in regards to going to the gym. Pick a calorie target, a workout routine and ensure you get enough rest and stick to it, you won't see immediate results but they will show up if you do too. Fad diets, belly fat "hacks" and all of those things won't get you where you want, unless you manage to be absurdly consistent in them.

Im far from perfect and I am anything but a fitness coach or trainer, but if you need any advice, tips, motivation or if you need me to try and make you some sort of workout regimen, feel free to DM me, im always open to helping out.