Not sure where to put this ?

I know this has nothing to do with the topics here but I just didn't know where else to go . So I'm 17 and I'm currently driving , since I don't have my own car yet i use my dads truck . Alright so today some girl came up to me in school saying that I hit her sisters car the other day on our way there I asked when since I don't remember hitting anyone I'm usually very careful about that . Well she was like I'm not trying to be mean or anything but either you pay or we're gonna report it . I just said I'll pay , is it bad and she just said i don't know but I remember you were the one and I was like okay here's my number tell your sister to call me ... When she left my friend that was there was like did you do it , and I said idk I honestly don't remember that happening at all . So she said to find out if it was really me if not then why would I pay for something I didn't do . 
My question is, if there a way to find out if it was really me who hit the car ?   I don't know why she didn't stop me that day if it was me you know? 
I checked the truck  and there's no mark that shows I hit someone.. So idk . Please comment if y'all have any advice for me