What should I do at school?

Ok so im in 9th grade this year(high school) and my bus gets to school so early. we get there from 7:10 to 7:15 usually and school doesnt start till 7:55. i am finding it harder to find things to do w/out looking stupid. i only have a few friends but they dont get to school till atleast 7:40-7:45. I cant go to the library. My homeroom is usually locked to the bell. I try to act like im doing something walking around the halls like to the bathroom to do my hair. my brothers friends(11th grade) make fun of me(together, not in front of me but my brother tells me) cause i walk up and down the halls. we only have 2 so i cant get away and walk somewhere else. this is impossible. What should i do?