Advice, I’m crushing😭

Okay so I’m 21 and it’s this regular customer who comes in that I have a hugeee crush on butttt he seems like he’s 30-40 yrs of age I don’t know but he doesn’t seem married but he seems sort of serious. Advice?😭 I don’t expect nothing out of him or nothing but yk😭 I blush so hard when I see him its ridiculous. *Please don’t try and be funny, I’m already knowing *