How much hair loss is normal?

I have very curly, long, and frizzy hair. Every time I take a shower I take a shower I feel like im pulling half my hair out. I don't notice any bald spots or thinning but I still just don't understand how its possible to lost this much hair. It is only when im in the shower, I don't notice any hair on my pillow when I get up or on the car seat or anything like that. When I run my fingers Thur it dry ill sometimes get a strand or two but nothing like when its wet. How much hair loss is really normal?