Oh, hey we're the same age orangejuice!
I realize I don't know anything about your situation but you should see a professional, especially if you feel that your life is not worth living (because it is)
If you're worried about actually committing suicide or otherwise trying to end your life, please, please consider either talking to a trusted friend or calling:
National Suicide Prevention Lifeline: 1 (800) 273-8255 <---Open 24/7
I can't post links yet, but google National Suicide Prevention Lifeline and you can even find someone online to chat to.
Now, with that out of the way, I'd like to tell you a story. I forget the age I was at the time but it was somewhere between 10 and 15. My father always watches the news after work, usually with the lights dimmed because it's manly or mysterious, I suppose. Anyway, the news report was of some famous actor or celebrity that had committed suicide; I didn't know who and I honestly wasn't paying attention.
Especially back then, my dad sometimes had issues talking about heavy topics head on, but he always meant it from the heart. I heard him make a sad comment about said famous person "...sucking on a shotgun," then he turned to me and said, "[Wallaby's Real Name] it's never bad enough to end your life. Things will get bad, they might even be more than you can bear, but you are worth it and your life is never worthless."
That always stuck with me and although I've never told him, I appreciate the advice more than I can put into words because I believe it's why I've never had any inkling of a though of wanting to die.
So, because I believe that advice, because I believe in people, and because I believe that noone's life is pointless:
You are worth it. Your life is not pointless.
You mentioned your mother and I imagine there are more people who would miss you than you may think. Not that I want you to feel guilt for wanting to end your life, because you shouldn't! You're still hanging in there, and sometimes living is the hardest thing a person ever has to do. You should tell yourself that you are worth. Say it to yourself until you mean it, because you are.
Although you should still see a professional because I am absolutely not that. If you don't know where to start, you can ask a family doctor to get a referral or Google it.
You can do it, I believe in you