I was suicidal myself around that age. Friends had already graduated and getting married, while I had nothing. I was depressed for years, doing pretty much nothing.
But now that I'm better, I feel that it was really dumb of me. There's so many things I want to do now, so many languages to learn, books and articles to read, shows and movies and video games and music to experience, and even some places I'd like to visit before I kick the bucket. I could've done so many things back when I was younger. I could've at least accomplished or gained a head start in something by now, if only I hadn't spent all those years being depressed and wallowing in self-pity. What a fucking waste.
OP, just do whatever that makes you happy. Stop caring about what other people think of you. You will never be happy that way. If you're the type that has a 'tunnel vision' that can only focus on the bad things in life, then make it work to your advantage and start focusing just on the good things in life. There's so much good and wonderful things to experience in this world, so much of them, that you can't possibly experience them all in your lifetime.
Start by appreciating the fact that you're alive. Appreciate the fact that you have food to eat and a roof on top of your head while many others in this world don't. Take care of your health. Eat healthy food, take yer vitamins, exercise regularly, fap to your heart's content, and get enough sleep. It'll take awhile, but you'll feel better. And be kinder to your family. At least, these are the advice I wish I could give the younger me.
You're alive and young, damnit. I wish I were your age right now. Stop being a faggot and just do whatever the fuck that makes you happy.