A very good question, but possibly any attempt to answer it risks waxing a bit philosophical. Which as someone who read philosophy to degree level I am certainly capable of doing, along I think with a good many others here ;)

I don't think myself that you can easily disentangle those traits which are basically your genetic inheritance from those which stem from your upbringing; after all in most cases the same two people are responsible for both.

Nothing wrong in my book in being very glad you are tall, or handsome, or intelligent, or well endowed, or even all of them together. Or even of just being a nice guy. Even the capacity to work well with what we've got has to have a genetic component.

But in the lpsg context: I freely admit to having arrived a long time ago (after not a little difficulty) at the point where I can be proud of my size and capacity. But I would be very ashamed indeed if it ranked remotely near the top of the list of what I had to be proud about.