I don't believe in regretting for past actions but now I regret not pursuing my passion for singing. It's turned into a regret for I'm not praised anymore for my singing inside my home. The reason is associated to my marriage with a trained musician. Now everybody just knows how bad (technically) a singer I'm, haha.
On a serious note I don’t regret the things I didn’t do, I regret not finishing the things I started.
I started the thing because I liked doing them, because they interested me, and because I grew passionate about them.
But I dropped them because I was too lazy, too comfortable and too work-aversive…....
Now I think the same is true about my passion for singing.