You tried a side of yourself that now you don't like.* Like
  +[1]Richard Hernandez* said - it's learning. If you always did
  everything right, you might never know when you've done
  something wrong. Cliche?* Sure.* But it's also true.* Sometimes
  a mistake leaves a little annoying reminder inside of you: "Hey,
  psst, remember the time you did that thing?* Remember how you
  felt afterwards?* Yeah, this thing you're about to do? It's just
  like that time.* Do you REALLY want to go through that again?"
  and so it becomes one of the bits of your conscience and helps
  you make decisions throughout your life. Personal evolution.*
  This stuff is a part of it.* It's like Pokemon evolving except
  you get many more evolutions.* I've probably had dozens of
  evolutions - old "me's" that I look back on and go, "Oh yeah, I
  remember when I thought that was a good idea but I've improved
  now".

References

  Visible links
  1. https://plus.google.com/111084752351321491049