How to get out of auto contract? best answer gets 10 points?

-I just signed a contract for a car but realized, it's overall too expensive and I found a better deal. I signed the contract yesterday, and it's still on the lot until I have to pick it up and pay for it saturday. I haven't drove at all after i signed the contract as well.Am I able to back out of this contract? How do you think i should go about this? My bank did not deny my auto car loan but they did not advice it and said it would not be wise to go through with it. What are my options? Should I have someone at my bank speak on my behalf? a representative said they would...