Can i cancel my car loan by not providing proof of income?

I bought a car last week, I had it financed and I signed the paperwork. As I got home, I got buyers remorse, it's a car that i can't afford, ( I know dumb for signing) I tried talking to the dealer but they won't let me off my contract. The thing is I never provided them with proof of income. They've been calling me all week for it. Is there anyway I could get out of this deal by refusing to show the proof income? I really, really can't afford the car. I'm a DUMB college student that made an impulse purchase