I'm feeling really depressed lately..?

I'm fifteen and a sopre in high school. I can't seem to get a hold of why I am so depressed lately. Everything seems to be irritating me. I can't focus, at all. I will be sitting in cl and spacing out, staring at my desk. I am very outgoing, I'm known for it. But lately I can't seem to work. I'm so jittery. School isn't hard, homework is moderate. It's been rainy outside but I doubt that's it. I enjoy the rain. I go to bed just frustrated, my life is so boring. My grades are fine but everything I do seems to not work with everything else. Like throwing away trash, and missing a thousand times. Little things that are driving me crazy. I have been more tired lately, even though I'm getting 7-9 hours of sleep a day. I go to bed and try to cry to see if it will help but I can't shed a tear. I'm not sick. I've also been very compulsive lately about simple things. Moving a pencil over an inch. Evening out my notebook. I have been felling very irritated when i have to turn in a paper with a wrinkle in it. I can't seem to get ahold of what's wrong. I feel un needed. That's it! I told my parents but they say it's just been a gloomy week.. I know this was long, that's for listening.