I think that I'm depressed?

Hi, Im ninteen, names Pierce. I used to get depressed all the time and sit in my room and end up doing more damage thinking to much and not wanting to do anything talk to anyone. I get very negative and moody. I have alot of hate and anger even though im a good hearted guy. It drives my friends and family away. The sad thing is I know its stupid and pointless but still do it sometimes. I figured out sometimes music or movies help , even if they are sad getting emotional sometimes helps.Going outside and doing things you enjoy helps also I try to think positive and be thankful for what I have. Things can be so much worse and its not worth it life is way to short. Talking to someone instead of your self concious is really helpful. Even if its just someone online you can relate to!