Did I Make A Mistake?!?

This whole situation is just weird. He is messing with you. Is this guy your age? Do you even know anything about him for sure? STOP sending pictures to him, ESPECIALLY online! He possibly even thought you were just having fun with him, and then when you said you liked him, he was taken back because he thought you were just fooling around online. Regardless, quit with the pictures. You are already starting to regret it, so you shouldn't give yourself more things to worry about.