Back in the days of elementary school, I didn't believe I was useful for anything nor was there anything I thought I should live for (being constantly harassed by dumbfucks for peers was a major factor). But anyway...
I feel pretty confident that I'm here for a lot of reasons. One, like others have said, is music. It still amazes me how so many VGM and film composers can write a wide variety of material just for the sake of aural enjoyment... I grew up hearing the works of Kondo, Ishikawa, Wise and numerous others playing video games as as kid.
Another reason is getting a good education. I try to do my absolute best in high school, and nothing less, so that I can have the choice of going to university in the future, and more options on what job I'd like to have.
Lastly, but most important, is the friends I have. I hardly have any in real life but those who I am friends with on GFF and other places are simply the best I could have. I'd have to say that they are the reason for bringing me out of my state of depression that ended about two years ago. Life in general is just so much better when you have someone to talk to, and not just for personal problems.
Jam it back in, in the dark.