And if you were to ask a church leader or teacher, they would tell you that you HAVE sinned, and must be honest about it. It's time for you to realize it's a forced guilt trip. Don't play the game. Don't even visit a playground where people like that frequent.
If you are forced to into a Confessional, and feel you have nothing to confess, then tell the priest you don't want to talk to him, and leave. The priest can't tell anyone what you said in there, and if he does...money, money, money.
Also, you could make a scene by saying that you will not be forced by an adult to get into a dark closet with a priest. And if anyone, even your parents, object at you, call the police. Seriously, enough with wacky religious folk hiding behind religious beliefs.