How to figure out if she likes me?

ok so theres this girl i like i think she might like me i don't i doubt because she has a boyfriend but i met him and he is an ***, cuz some nights i don't sleep cuz i just think will i always be by my self cuz i have depression i would tell u bout that but u don't care,she has so many friends i can't talk to her and shes way out of my league and i can't tell if she even wanna talk to me but she does the same sports [b-ball and track right now] as me she looks at me and i look back and we make eye contact in class and clear across the lunch room during lunch. but i don't know and she laughs at my jokes but im guess everybody thinks im really funny in my school so thats why people like me and she also gets close to me when it doesn't seem strange, and one of her guy friends who is very nerdy and is my friend idk if i could ask him if she liked me or even what she likes in a guy but that would creep him out, do know how i could figure out if she likes me some how or even get her to talk to me more cuz we don't know each other to well i just wanna be by her side i cuz i like her a lot i my depression wouldn't be as bad cuz i would have