Just Friends and I don’t know what to do

So I’m a sophomore in high school and this guy that I like is a freshman I always thought it was weird when girls like younger guys but honestly I don’t know how to feel and he knows so much about me and honestly I haven’t told anyone some of the things I have told him and I feel like he only thinks of me as a friend but I don’t know what to do if I should tell him or if I should just keep it to myself