Buying condoms for the first time

🪐 E.T 🪐

So I know this post is gonna seem stupid as fuck to most people, but when I was in high school I got condoms for free off the nurse. Now I've left high school me and my bf are gonna have to start buying them from the shop and I feel like my face will go super red at the counter & I keep getting anxiety thinking about the cashier turning me away because they think I'm too young or something 😳 are the allowed to refuse to sell them to you??