Should I be embarrassed to show my nipples?

No. They are part of who you are.

One of the tags is “boys” so I’m assuming the OP is male.
No, there’s no reason to be embarrassed.

Well do you have three or more? Which would be a good conversation starter by the way. I think we all have nipples. Don’t worry about it.

You could cover them with band-aids.

No… not really. Every human has nipples, not just the girls. But unlike the girls, boys won’t get arrested for having a bare chest in public.

But more directly… do what is comfortable for you. I never went without a shirt during my childhood and teenage years. You probably will never see me bare chested today (i’m 26 now) even.I have no reason for it and you don’t need a reason for it.

IF your swimming or something no big deal. I’m not sure it’s polite in sitdown dinners or Walmart though.

Are you speaking of through or under clothing or direct?

Show them to whom?