I know it's odd for a young guy but sewing relaxes me. Attaching objects together using stitches is just my cup of tea. Do you do crafts?
Hey, I did learn how to knit when I was like 12 years old, but I don't remember how anymore. I do still know how to sew though.
I do quilting mostly. Sewing is one of the oldest of the textile arts. I'd love to learn to knit. I;m sure women would did it in a young single guy. 
I learned to sew when I was in the Boy Scouts. We had to learn to sew our badges on!
Before modern day stuff archaeologists believe Stone Age people across Europe and Asia sewed fur and skin clothing using bone, antler or ivory needles.