How can i get my brothers trust back?

im 13 and a girl. the other day i was in the study with my older brother who's 22. he was keeping his laptop screen so that i couldn't do that. he walked out of the room and i saw him walk into the bathroom and i walked over to his laptop. it was still on. i knew that it would me something to do with his schooling (he becoming a doctor). it had a opened microsoft word open. it was labeled male anatomy. it had pictures to go with it but it was mostly words. then i saw a picture of a naked guy. my brother walked into the room just then and he yelled at me that i shouldn't be looking at that. i ran out. he looked at me really weirdly that night. he hasn't talked to me much. when he does i walk away because i feel like he is going to yell at me. he is always looking at me weirdly. how do i get him to trust me again?