New Job Crush?

Hey everyone, I started at my first job last week and there's this guy who works in another department. He’s super nice, always smiling, and whenever we bump into each other it feels like a little thrill of excitement. I’ve even found myself pretending to look for something at the printer just to get an excuse to talk to him! But honestly, it's getting pretty silly. Am I totally out of my mind, or is this normal when you start a new job? Should I even tell him how I feel, or should I keep things professional and chill out a bit? What do y'all think?