I think i might be depresssed

I feel apathetic. I don't really care about my grades,I'm just keeping them up out of habit and this vague notion that I need to get into post-secondary school. I haven't done any of my hobbies for a while. I haven't gone horse-back riding in soooo long even though I used to love it. I just feel like sleeping. That is all I want, to just sleep all of the time but I can't because of my few obligations and just plain biology. I've drifted away from most of my friends. Mostly I just don't like being around them anymore. They seem like an old phase of my life I just want to leave behind. Of those that remain, I hate one (but we have bio together, and go to this thing every month, so I just leave things) and the other isn't really that interested in being my friend. I have yet another vague notion that if I found a group of people I liked I would be a lot happier, but I don't really feel motivated to talk to anyone or make friends. I'm pretty limited to the social prospects of my highschool which aren't too appealing. I just sit in the library at lunch and read fiction because that's all that really seems worth doing anymore (because it's no trouble.)