Why can't I take a compliment?

-"You have such beautiful hair!"
-"Yeah, but it sheds so much.  You should see my shower drain.  It's disgusting."

-"You have such nice skin.  You're like a porcelain doll!"
-"Oh, but I break out so much!"

-"You have a pretty name!  Your mother made a good choice!"
-"I wish she chose the English version.  No one can spell it or say it properly, and it just sucks."

People actually said these things to me recently, and I actually responded this way.

Why?  WHY??????