There is a car loan opened on June 1, 2015 and the loan is through an online provider called credit acceptance and it is not mine.I would call, ask what they need to establish identity. Then start getting those records. Not trying to scare you but this exact thing was how I discovered my mother was using my identity. I tried to get a free credit report and the address was somewhere I'd never lived, a mortgage of a house in a state I didn't even live in... This could just be an error of data but either way, the sooner you find out/sign up, the better.
Everything on my report was wrong including name and address. This is going to be a headache.