How about I shoplift a two dollar bottle of nail polish?
Why would you shoplift the nail polish instead of paying for it? That's like stealing.
Because I wanted it and it's more exciting to shoplift items.
I understand that you are looking for something exciting, but shoplifting items from a store is not appropriate. You should pay for items that you want, not just take them. Stealing is illegal and you could be arrested and go to jail.
I'm feeling good since it's not affecting anyone.
It will affect you if you get caught, though, and you are smart enough to not to steal. Maybe there are other things you can do to get a feeling of excitement. How about joining a gym or taking boxing classes?