any tips on buying pads at store?

I get really shy when buying pads at the store! I feel like everyone is judging me! I'm quite young and feel as tho I shouldn't be buying pads even tho I have gotten my period and I only live with my dad and have to buy them myself! Any tips on how to be more confident? Don't say just doig or you shouldn't be embarrassed! I also have tried going to a self check out but There aren't any stores near me with a self check out! So any tips on how to be confident when buying them with a cashier? cause I actually need a guide line! Thank you!!