So I am in 8th grade and school just started. When I walk around the school a bunch of random grade 9 guys tell me that their friend thinks I am sexy or they just wave at me randomly when I walk by. Are they joking and just being friendly or do you think they like me?
If they say you're "sexy" they probably would date you. Whether you want to be with them or not is totally your decision.
They like the way you look. They don't like you, they are attracted to you. Quite the distinction.