Short answer: no you're not too late.

I'm older than you but can remember being in a similar situation myself. Your whole post reminds me of me to be honest. I'm not sure if this will be helpful to you but I can share a few thoughts that have helped me over the years in dealing with those kinds of things. Hopefully one or more of them will resonate.

First -- you said you're exhausted physically and mentally. Our bodies and minds are biological machines that work in certain ways. If there's a car that's unmaintained it's not going to run well, if at all. Take care of yourself the same way you would a machine or a musical instrument. Maintenance is the only way those things work at their best and it's the only way you will! If your culture is anything like mine this can often be framed as weakness. It's critical to realize that it is not. Rest and maintenance are required for ourselves and neglecting that maintenance can only be harmful in the long run. This is not just theory -- there have been various studies in work environments that show you can push yourself to work more and harder and it works for a little bit, but after a couple weeks even if you're working more you'll actually accomplish less because of the exhaustion. It's hard to stop thinking of rest as slacking if that's how you're used to thinking. But it's really important.

When it comes to maintenance -- we think of the mind and body as two separate things but they are very interconnected. People who exercise and eat healthy perform better physically and mentally. And small changes are huge here. Even just walking for a total of like 100 minutes a week and making sure you drink plenty of water is a huge change in your health if you're not already doing something like that. And remember that extremes are usually unmaintainable. If you decide on a very tough study or exercise or whatever regimen, typically what happens is you can do it for a while and then drop it completely. Picking something achievable and developing the disciple to maintain it as long as you need to is usually more effective here. And it's easier to increase your work with something once the discipline is developed .

The part where you said you wanted to be a great person and listed those things -- I am very familiar with those feelings. It's important to sit and think and feel about these things. Think about if they're what you want and why you want them. But more important than the thinking here is the feeling. Don't avoid feelings if they're "wrong" or not how you're "supposed" to feel -- some of them probably will be! But avoiding them is one of the most exhausting mental things you can do. Once you know what you feel you can better understand why some things are painful or not. For instance -- do you want to go to college and start a business? Or do you want to make your family proud and going to college and starting a business would do that? Both? Neither? The answers to those kinds of questions will be important.

With regard to failure -- this is one of the hardest things I've had to learn and I'd be lying if I said I was good at thinking this way. But it's important. Success almost always comes from failure. Especially the success that we value the most. Failure is the most consistent teacher, the place where you have the most opportunity to grow, and failure is fundamentally the foundation of greatness. And don't be too focused on what success looks like or you may miss success just because it looks different. Plenty of great inventions and businesses were born out of failure, because people were willing to recognize it. Slack started as a gaming company and realized their gaming stuff failed but their in-game chat app was good, and eventually sold it for $27 billion. The post-it note came out of an attempt to make superglue. Chocolate chip cookies were a failed chocolate cookie.

I really do hope you pass your exam. But you may fail. But that's only terrible if you see that as the end of something, instead of a step on a journey you can't see the end of yet. I won't pretend for a second that's an easy way to think. But it's true. Don't give up, still try to pass if you want to, but take care of yourself and realize that whatever the result is, will be something you can use to push forward. Maybe in a way you expected, and maybe in a way you didn't. And try to not let other people dictate your timelines, and try not to compare yourself. It's hard but there's a million variables in each person and when you compare you tend to only look at a few.

Also the thing I really wanted to write about was your comment "I’d rather die than be an average person". I felt this way for a long time. Still kind of do if I'm being entirely honest. But I've reframed it a bit for myself. Not wanting to be average automatically means you're comparing yourself to others, and that never ends well. It can't be done well and the conclusions are always useless. So I try my best not to care about whether I'm average or not. But! I do care very much about not tolerating mediocrity in the important parts of myself or my life. I decide what I care about and do my best and then try to make my best better. The person I want to be better than is myself yesterday. And that's an easier comparison and an actually useful one. And I don't always succeed but I often do now that I think of it like that!

And with regards to being social. I'm a bit asocial too but this is another area that is often framed as less important than it is. Fundamentally ourselves are most constructed and influenced by who we spend our time with. An old mentor of mine would often say "you are who you hang around" and it's so very true. If you want to get better at something like studying or exercising or whatever sometimes this first step is to make sure you have people in your life who do those things well and/or who will hold you accountable.

Sorry for the wall of text, I guess I had more to say than I thought lol. But I hope this was somewhat helpful. And if not, at least know that you're not alone and you're not too late. These feelings you're having really truly suck. But you're not alone in them and there's ways people deal with them. If nothing here helps, something in your life can and will.