Hiya there I signed on the 3rd May and they didnt make me purchase PPI but did make me purchase Gap Insurance

Hi, Im new to all this. And i cannot believe what i am reading and what i have got myself into. I recently got a car from ACF and got a finance on the car through the funding corp. when i recieved my "contract" it states that the interest rate is like 44.8% or something. and the car is worth £3000 and im having to pay back £13000. i regret doing this and is there anyway that i can cancel this and give my car back. they will be taking my first payment out on 3rd june. im really really stuck. someone help!!!! please!!!