<p>I think it’s a good idea to tell someone about it-- the police or your parents…
It doesn’t sound like you really damaged the car, and if that’s the case, it probably won’t be a big deal.</p>
<p>As a side note, someone bumped my car when it was parked-- just after I got my license. My parents noticed it before I did, and they wouldn’t believe me when I said I had no idea when or where it happened. So in the future, do the right thing no matter how late it will make you.</p>