I love you

There’s this guy, we’ve known each other for nine months now. About three months in we both mentioned that we liked each other more than friends. I’m 18 he’s 19. I want to tell him that I love him but I don’t know if I should say it and how to or if I should wait for him to say it first in case the feeling isn’t reciprocated yet. I don’t want to make anything weird between us. I feel that we can tell each other anything and we can be goofy and stupid around each other. Lol. We agreed to wait to get into a relationship until we’re both finished with college but we’re basically in a relationship without BEING in a relationship.