I am 21 years old.
Up until about 15, I was a selfish, rude, and unfriendly, among other negative qualities.
I used to have regrets about this and feel bad about it all the time. Not to mention embarrassed.
I tell myself that I did not harm anyone or do anything that had any impact on anyone's future.
I no longer feel horrible about it. It's in the past.
Seriously, it's in the past. If that selfish, rude, and unfriendly person is no longer who you are, don't worry about it. 
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Not my chair, not my problem, that's what I say.