This idea of selfishness as a virtue, as opposed to generosity: That, to me, is unnatural.
There are no mistakes. The events we bring upon ourselves, no matter how unpleasant, are necessary in order to learn what we need to learn; whatever steps we take, they're necessary to reach the places we've chosen to go.
One of the most important things that I did to turn my life around was to realize and to accept that from this minute, that's all we have. Everything that happened behind us we cannot change so you might as well look to the future.