What Can Cause Extreme Sensitivity Of Muscles ?

Hi, I'm a 18 year old girl and about a year ago this started happening to me. When I'm just playing around or wrestling, (not even hard just a push) I get hurt so easily. It never used to be like this, but I stopped eating dark meat. Is that what is causing this? and if so is there something else I can eat that will help. it's not that I bruise easily, its just a simple shove will hurt even the slightest bit. I'm so sensitive and I cant stand it.