Here's my advice, it got me through 3 years easily.
Establish yourself in a group, and don't be hated by the group. I joined marching band Freshman Year, best decision of my life. I met my girlfriend there, and met a bunch of friends. A lot of them being seniors, so you're already pretty high up in the chain.
Don't piss off anyone. Stick to you and your friends. With that being said, don't be an awkward freak when you're with someone you don't know. Try to make as many friends as possible. It's like a game. Once you make friends, don't keep them off, hang out with them outside of school from time to time. I just went to an amusement park today with a bunch of friends, some I haven't seen most of the year, and god it was fun. Keep your friends close.
Keep a close ring of friends. Make it consist of your top bros, maybe your girl. Make sure you 100% trust them, and seriously, when you need someone to talk to, go to these guys. I bottled up my feelings most of my life. After being able to talk about them, I've felt so much better and confident about my life.
If a friend is abusive, a douche, or a general richardhead. Just leave him. He's a roosterface, and you deserve better than him. I've made a mistake of keeping a guy like that around, and he's done nothing but piss me off, so I told him how it was, and he's left me alone from there. We talk a bit, though, and he isn't that bad anymore. I'm still keeping him off my friends list.
That's about all I'll cover with you, because I could keep going with this for awhile.
