I was once complaining to a friend about a job I had done that I really did not like, and regretted having done in the first place. He piped up with some really good wisdom:

'at least now you know that's one thing you don't like. You know not to do it ever again.'

And he was right.

Things we don't like, no matter how much we don't like them, always have a silver lining. We gamble with ourselves everyday with the decisions we make. To do this, to do that. Things we don't like take a lot of our options straight off the table. It is like a cleanse, getting rid of the things that wouldn't have made us happy anyway. We shouldn't regret these things, we should be thankful for the insight they provide.