Hair and strands you can pull from it

I have thickish wavy curly brown hair, I'm white, and my hair feels healthy but is a little on the dry side (cause of the curliness). Why is it that after I take a shower, or when I brush my hair, if I run my fingers through my hair I can pull like 6 strands of hair off? And if I do this like 5 more times throughout the day it will do it again?? Why do I lose so much hair? This has obviously gone on for years and my hair seems fine but I'm just really curious as to why it seems you can pull extra strands of hair off all the time.