I'm sorry you feel this way… We are quite close in age and I feel a lot of times like there is no point in living. I've tried to take my own life in the past and I was suffering from depression and I can understand and can relate to what you are going through. I hope you find my answer a bit useful…

Although right now you may be in the deepest darkest hole of your life… you CAN get out. Unfortunately this does take a lot of time and healing. It means your going to have to open up to those around you and realize your true worth. Because if you don't you won't have much to live for… I feel like right now (and this may come off as a bit selfish and for that I apologize) that you're only thinking of yourself. And that's alright but your family loves you and wants the best for you. They paid good money for you to get an education… Please don't let their efforts go to waste. Show them you appreciate that by loving them, yourself, and trying your best in school. One day your going to look back on your life to where you were and smile because you realized you had what it takes to keep going on. Something many people find it incredibly hard to do… but I know you can. Suicide is not an answer it should never be… I know you feel this now but please think about what I said.
Good luck.