You'll never get caught stealing lighters. Normally they have them in some random part of the store where you can take them. I remember when I was your age, me and some friends would steal like 10 lights at a time whenever we needed one.

And seriously, you'll never get carded. No one knows that you even need to be carded. Once I saw some kids being refused sale at a 711 but that's because there are always cops around there. Just go to Cosco or something.