I used to make myself sick over this very point!
So not only would I have the damage to upset me but also I'd dwell on it for hours after it happened, making myself feel ever worse.
So, yep, I feel for you and can commiserate!
For my cars I now take the view that I'd rather enjoy them (and maybe dent them) than keep them in perfect condition and not use them (only for the next owner to get the benefit of a cheap car in mint condition). It's hard but I'm trying!
