I think that you need to acknowledge that, no matter how mature or intelligent you may be, or may feel that you are, you are still a teenager and he is still a man. The age gap isn't huge, but the experience gap may be. Be wary.
Should you tell him your feelings? I don't know. Maybe. Then see how he reacts. Would he be willing to wait until you are old enough for an adult relationship? Would he respect your comparative youth?
It's difficult to advise, when you don't know the people involved.
Good luck.
