Is it normal im told im kind, despite my past, and my friends?

Basically, I hang around with a group of people, sure enough, people like them. But to put it bluntly, my friends including me, we are all idiots except my best friend. We smoke weed, spit on girls who threaten us, annoy people just for a laugh, have frequent fights, mouth off to people and well.. Cause genuine chaos. I hate my past, I was, have been, am and always will be a terrible person for the things I have said and done. I regret it everyday. And to atone for this im kind. I've started... helping people. I've turned into Mr. Righteous, although my friends don't make fun of me for it, they need me. I dont need them. I can tell they are dissapointed when I do the Mr. Nice guy act occasionally and help someone they pushed over, comfort a girl they spat on for mouthing off to them. It doesn't need to be said. But all of this doesn't feel like enough. I feel like I belong in prison, in hell and never deserve kind treatment.

Mr girlfriend has NO IDEA of my past (well a rough idea) she always tells me im the kindest person shes met, i help strangers, smile and tell everyone to have a nice day.

I don't deserve being told im nice and kind, especially by someone as kind as her, someone we would have antagonised. is it normal to think that?