I need help plz help me. Am i a nerd or loser?

1st ill tell u i have 3 older bros and 1 lil sis. i am 14 yr old and a freshmen. my bros r 15, 18, and 24. my mom died so i live wit my older bros and lil sis. my bros who r 15 and 18 pick on me all the time. So im picked on at school and home. i tak my anger out on my lil sis whos 9. i try 2 say sorry but sometimes im 2 mad. heres my question if seniors r mean to me everyday and so r my bros friends and bro whos a sopre am i a nerd? And what can i do? Im a football player and hav friends but older ppl r a problem. what can i do? Help?