I really have a huge crush on this guy?

He's in my french, study hall, homeroom, and lunch periods. We're friends and we always sit together. He's really nice....like he opens my locker when I can't....once he let me put my books in his lockers....we walk to cl together. Idk how to go about this. I'm in high school so I know I can't like....do stupid middle school stuff. Do you think he might like me? How should I tell him that I like him?