"It's better to regret something you have done then something you haven't".

-- Gibby Haynes (And/or lots of other people)

As someone who regrets a lot of things I've done and a handful of things I haven't, I'm very much inclined to agree.

Learn from that then, for the future, do what you won't regret in the future.

But be aware, it can cause its own issues. Example, dating and saying what you really feel when you do. It can cause things to end quickly, but at the very least you won't regret not having said what you felt. :)

Regrets are chains you put on your own legs that weigh you down for the rest of your lifes journey. Just put them aside and agree not to wear them again in the future.