I feel so dumb for blushing

I’m not out at work and where I work it is very hard work and a male dominated field so I don’t plan to come out. Working with these guys has its perks like nice eye candy but there’s one coworker that always makes me smile like a clown. He’s so dumb n cute and my type. Today I could barely contain myself and I feel so dumb for doing so cos I have no chance with any of them including him. Ugh does it have to be like this?! I really really hope he doesn’t notice me getting flustered.