Would they possibly call the cops on me?

There’s a liquor beer and spirit store near my house up the street and I’m 21 now but I look younger. So I was wondering if I got beer and showed them my id when they asked for it and if they didn’t believe me or thought it was fake, if they would just kick me out or call the cops on me. Which would be pretty stupid if it were that serious but I hope it wouldn’t come to that. Anyway I don’t want them to call the cops or anything because it’s not like I can get in trouble, but if anybody in my family found out about it they’d give me a hard time about drinking. I guess all I really care about is their bad impressions of me since nobody in my family drinks.