When I was your age I had similar issues. No friends, family, real teachers or anyone else to teach me about life or show me a better way, and yes I was very suicidal as that seemed to literally be my only option. Well, today I'm in my late twenties and I can definitely tell you life gets a lot better if you stick out for the long run. Though things seem difficult to work with, it's only like that if you fight against it. Best thing you can do is...go with the flow
that's right, sometimes it's best to let life take it's natural course. You may not agree with it and maybe it is wrong, but the more you fight against things, the more it fights back. There are times where you just have to let go, not necessarily give up, but just let things work on their own. It sounds silly but you'd be surprise on how things can work. That's what I did, stopped fighting things and let them work themselves out, I mean it's still not perfect but it get's a lot better
Also, just because no one showed or told you of a better way doesn't mean that there is none for you. You have to decide your own future, regardless of who gives you options. If your around a bad environment, you can still distance yourself from it and stay true to who you are, and not succumb to the wrong that's around you, if your will is strong enough of course. If you weren't strong enough to work with a situation then it would had never came to you so your already strong enough to shape your own future regardless of who's not helping you or who's telling you wrong. Feel better now