Comments...

Isis wrote this in the comments
I thought this over when I started knitting/crocheting again after a long interval and for me it is clearly because I NEED to create things with my hands... baking bread works too and so does gardening/planting things. I have a brainy job and doing things I can actually touch with my hands keeps me sane and balanced (or so I hope). It's a need, a drive, much like an artist feels the need to create art I suppose.

You are right. That is also part of it. Even from my early childhood I hade to make things. Do stuff with my hands... Gardening, baking too... but MAKE things. Sew, make clothes, blankets. Knit. Bead, make jewlery. Whatever. Just DO...