Am I................depressed?

I don't hang out with friends anymore. I can't stand to look at my mom or talk to my sister (even though we have never fought!-because of out 13 year age difference) we i eat lunch at school i eat and just sit there listening and nodding. I don't feel like talking. i get my homework done in cl with a 90-100% correct. When i get home i go to the computer and just play the game i've been on for a few years and check my email, facebook, and other items needing addressed. when my mom yells at me for spending too much time on the computer and going overage bills on it i just nod and tell her il try better next time. when she asks me to do something i do it because i'm bored. my mom thinks i need to see a therapist but i just want to see a doctor because only doctors can really tell if your depressed. my teachers have noticed something different and ever time i get up-to sharpen a pencil, ask to use the restroom, or get a hall p to get a book-they ask me if something is wrong and i feel ok. is there something wrong with me? And im not interested in comments like go see a doctor or therapist that's not an answer....