i accidentally dented someone's car with a shopping cart

as the title says, i was at the store last week, and the parking lot is very uneven and basically a big hill. i didn't realize this, so as i brought my shopping cart in between my car and the next, i let go of it to open my car door. as i did, the corner of the shopping cart smacked into the car next to me and chipped off some paint and left a small dent. i felt horrible but i panicked and left. i still feel very bad. it wasn't a super super nice car, but it certainly didn't have any dents before.

i feel like i should have left a note, but even if i did, i don’t and won't have money to fix it. i feel like a dick.