PLEASE HELP 😩

Hello guys I'm very embarrassed to write about this but I need some insight, please try to read through the whole thing and understand my whole situation, so, I am 18 and a junior in high school .. I started school late and got held back a year, this obviously makes me older than the other people in my year , here's my problem these are the people I've grown up with and grown a close relationship to and the guys who I've grown to really like is 15 ... I know that terrible and I've tried to get rid of the crush but with me being around this age group and getting close to people all around this age I find it hard to look for older guys or guys around my age because they are usually all in college and harder to relate to or not interested because I'm still in high school. Do you think it's bad that I like a guy who is only 15 considering these are the age group I've grown relationships with ?  Also I feel like my age excludes me from any high school relationships which makes me sad to see all my friends in cute happy relationships, also take into mind the fact that 15 year old girls get with 18 year old guys, so let's not play gender roles here , I really am not looking for rude comments but I bet I'll get some anyways, I just need some advice