Do I have depression?

Since autumn of last year, my desire to prosper at school declined. I used to be an overachiever a few years back and now, all I just don't care about school anymore. Even my attendance isn't that good anymore...I keep getting late because of being unable to sleep at night from being so anxious that I will probably do bad at school the next day (I feel hypocritical since I said I don't care about school but I guess in my subconscious I do care? I'm so confused...). My concentration and decision making has gotten progressively worse since the beginning of the school year, and I don't know why. I don't even enjoy hanging out with my friends anymore...I occasionally go out with them just so I spend time with them, but in actuality I prefer to be alone; I don't even like talking to people anymore, other than the occasional "how are you doing?". Of late, I've been experiencing bad events, which only make me feel worse than I do everyday, and guilty that I'm doing nothing to do anything about those bad events. I feel so guilty that my problems are nothing compared to what people in third-world countries are experiencing right now...While I know the symptoms of depression, I don't know my case is normal or if this really is form of depression. Thanks in advance.