So I kinda have a thing for this guy, I'm 19 and he's probably twice my age. But he doesn't look or act that old, he can be crazy and funny at times. he probably thinks I'm creepy for looking at him whenever he's around. I think he knows I been staring cause he usually looks back. Sometimes when he sees me coming his way he would look at me first. It happens quite often. We never talked. but the problem is he's a lecturer at my college though he doesn't teach me. How do I approach him? Is this even appropriate?