I'm thinking of keeping expensive headphones that I didn't pay for
I really hope you're kidding. Why would you steal the headphones?
I don't want to pay the outragous price and they are nice looking
You shouldn't steal things that aren't yours. It's shoplifting and if you're caught you could go to jail.
I do have a fear of stealing.
Your fear is rational as there are very real negative consequences to shoplifting. Do a bit of research and try to find some headphones that are in your price range, I'm sure you'll find some that are great.