btw, not having a "calling" may be the biggest, and only regret I have.
Like everyone, I do some things better than others, but I've never excelled in any one area to the extent of being driven to pursue anything specifically. My occupation has always been a "means to an end". Never could identify a passion that I could realistically make into my vocation.
I truly envy people who identify their dream early and pursue it whole heartedly. The person who says, "I've always wanted to be a teacher, or engineer, or policeman" and contently goes about their life growing in their chosen profession.
If I had the opportunity to do it all over again, I still wouldn't know what direction to go in.