Is it normal to be depressed about something after so much time?

My parents got divorced about a year or something ago, and I took that suprisingly well. My parents were afraid that it would affect my grades and everything, but it didn't, like nothing happened at all. But about 2 months ago, I started feeling very depressed, sad and unmotivated. I know it's because of the divorce, sometimes i just wake up in the middle of the night and think about my life, and just cry. Happens few times a week. My grades in school have flunk, my social life went down, like i don't know how to talk, usually i was always the person with great subjects, but now, I'm just in the background listening in silence. One thing pisses me off that none of my friends noticed that. I don't get it, why do I feel like crap after to much time? Will that feeling go away? I can't stand it anymore. I juat want to get rid of everything ( not suicide, all of my problems is what i meant ) lately i even had some rage attacks or whatever. A little thing pisses me off and i just want to throw it around, attack, destroy! is it normal to be like this? Please, I would really appreciate advices.