Recently me and my husband went through a trial seperation and i purchased a car?

during the separation i purchased a car out of both desperation and confusion. never buying a car before on my own didn't know a lot to look into and ask. i knew i would have high interest due to bad credit. but the car dealership charged me 8995 for a car i now know is worth 4500. i would like to return the car before the first payment. is there a law or anything that protects me from being taken advantage of both as a women and as a person with poor credit? i know now i shouldn't have jumped into the decision i felt at the time i had to decide and could not wait.