Did bullying cause my depression?

So in 6th grade It was cool then one fat asshole said "hey, look at (my name here) he has a unibrow!" needless to say everyone in my class bullied me but girls. Next year my so called friend came to my house and stole my brothers zune mp3 player and ignored me for life. I would walk around school doing nothing, hiding in dark halls. My brain was messed up mentally by then, i was addicted to runescape and it was my escape from everything, then I met some potheads and thought the reason I was so lonely is because i didnt smoke weed like everyone else.. Then in 8th grade it was "normal" for a month.. Then the bullying started Again. My whole classalwaya trying to bring me down i was a loner, one time they got a lot of trash from the field and put it in one pile. Then the whole class told the teacher i did if, and they all just laughed as i cried and was forced to pick up all of it. 9th grade it was still bad, the new thing to punk me about was my voice, and how nerdy i was.. Then one time i cried in front of a group of 7 so called friends, they threw ink at my shirt for no reason everyone was laughing at me so i started crying because there was too much tension building up inside me. Now in 10th grade i always feel like **** even though all the bullying stopped. I was always alone, so i went to a school were you go one hour a week and turn in packets. Im always at thr house know depressed all the time never happy, and my moms financial situation, my 25 year old sister that still lives with us neglecting her daughter and partying everyday sometimes coming hoke smelling of sex sweat which is disgustig. Oh and my 30 year old pothead brother with no job, doing nothing but smoking weed. I cant enjoy anything in life and im going to grow up to be a pidce of **** so why not just end it all now? Ill never get married and ill be a virin forever since i have never had a father figure to teach me anything and my self esteem and confidence is all zero