Be strong, you can do this. I promise.
I was where you are once, I first became a member of this site at 16. I felt I had no other option, I had no one to speak to and could trust no one. I was not close to my parents and still am not, no one would have taken me seriously even though I thought very seriously about committing suicide.
It is so hard, I still break down and don't see a purpose. But now I am 20, in college on scholarship and have a bright future. I still struggle, so much. But I opened up and put trust in a few people, sometimes it hurt me when they disappointed but sometimes it helped tremendously and was worth the risk. The future can be so bright, and people care about you. I do, and I do not even know you. But your post reminds me so much of myself. Hold on, it will get better. And even when it gets worse, it will get better again.