The most telling skill I wish I had, was the ability to play a musical instrument. I’m told I have a reasonable singing voice and can hold a tune. I can also make up songs and sing them. But all that has to be without musical accompaniment.
The instrument I most wish I could play is the guitar. Sadly, I can play nothing at all and that to me is a real deficit.
If I had my time over again; but it’s altogether too late for that.
EDUCATION, A LIFE FORCE 
I feel you, Henry. I am a singer, but I never managed to learn guitar or piano, though I tried. I guess not enough self-discipline to practice enough and persevere. ~Ed.
How I have rued my stupidity on this issue.
You and me both, Henry. Maybe if we howl like dogs together it will relieve the sense of loss. 😉
Yes, it is a worry.