I had that attitude when I was in my late teens. I asked a priest about it. He said that I had a malformed conscience.
He was correct. I wanted to do something that was a sin and I tried to talk myself into it NOT being a sin. That works for about ten seconds.
Sociopaths have malformed consciences. YOU don't have a malformed conscience. You know better at all times.
How do you know the priest was correct? And why would you let another person determine the state of your conscience?