I found a purse and took something from inside
Did you take money from the purse?
Yes, I took 500 dollars from inside the purse
Taking money out of someone's purse is stealing, which is not only immoral, but criminal as well. You should reconsider your behavior and return the money to it's rightful owner.
I'm not going to return the money, I don't feel like it. I own the money now.
You possess stolen money; you can't legally "own" it. Think how grateful you'd feel if you'd lost the $500 and the person returned it to you.