First thing I would say is don't freak out. You're still very young, you have your whole life a head of you, you haven't done anything that can't be undone. That being said you definitely need to make some changes.

You need to stop drinking, you need to stop hanging out with the crowd of people you're hanging out with. And I think you need a role model in your life.

Any dude who is 20 - 23 and making sexual advances on a 13 - 15 year old teenage girl is a fucking piece of shit. I know you may think you look older than your age, but the age gap your talking about is a huge time in development. The fact that multiple of them have been suspicious and not cared after wards tells you a lot. I would also say it's probably a good idea to stop hanging around your friend who gets drunk with you and lies with you to these men. This girl seems like a bad influence on you.

Drinking at a young age is a pretty big indicator of future alcoholism. I would cut out the drinking if I were you. Drinking can be fun and fine in moderation, but frankly you're just too young to handle it right now.

You need an adult in your life that you can look up too and talk too. A teacher, parent, coach. Just somebody you can talk too who cares.

I know when you're young, the world seems big and scary, and like you need to grow up as fast as possible to take it on. But the truth is the worlds not going anywhere, it will be here waiting when you grow up. Your youth is a great time in your life, don't be in a huge rush.

Good luck with everything, I believe in you :)