I bought a car and the payments are to high can i change the contract to a lease to lower payments?

Probably not. You could try talking to the dealership. Or you could trade in the car and lease a different one, but you're probably going to take a severe hit in the wallet for that.

If you're just wanting to do this because you've seen a an ad and thought "wait, those lease payments are a lot less than what I'm paying" you may not know that you usually have to put down a fairly large initial payment.