Why Do Girls Have That Mentality That They Suffer More Than Guys?

I don't think all girls do. It's just that girls are more openly emotional than guys. They show there feelings whilst guys hide theirs away. Therefore, girls can see their own pain, as its clear as day, but can't see a guys pain, as he hides it so he doesn't look like less of a man. That is how some girls get it into their head that they suffer more than guys.