Just because your aren't a quitter doesn't mean you should continue
doing something you loathe for the entirety of your life.
You can fail a million times in order to succeed. If you don't fancy
what you do, achievement will still be yours in succession. Just that
it doesn't come wrapped together with fulfilment.
If you want fulfilment, then you can't stop to find that perfect activity for you.
Quit as many things as you need, but don't quit the search for that fulfilment.
You are only human, and you can only be proficient with only so much.