Ever do something that straight away, you question? Everyone is all "blah blah blah, no regrets" but some things cannot be helped.
For me, there is two kinds of mistakes. The first one is the 'maaaaaan I regret that' mistake, the kind when you do something (like getting drunk in an inappropriate situation) and can live with it even though its embarrassing. The second is the 'oh fuck that should not have happened' mistake where you do something that actually was really fucking shitty and weird and you do not feel good thinking about it.

Mistakes happen. And people deal with them. Good people can make bad decisions and still be good people!!