Is this a skin sensitivity or type of mental disorder?

My whole life ive never liked my liked my own skin rubbing against its self or ceratian things rubbing against certain areas. For examples, i cant stand my legs rubbing against each other even if ive just shaved, lotioned, oiled, waxed, naired, powered, whatever, the feeling makes my skin crawl. Now that doest mean i dont like my legs to be touched when they are shaved but i cant stand them rubbing against each other. Sand is another thing that i cant stand on my skin. So much so it it gets itchy just watching any beach scene on the tv and i want to scratch my flesh off. I also hate feeling anthing touching the inner lining of my thighs. I wear baggy pants and undies and can not handle form fitting pants or pant hose  because they get twisted.  Lately my biggest irritation has been when my breast stick to gether or to my skin then come apart, and they dont have to be sweaty sticky either, basically ive always hated feeling my own skin and ive wondered if there was anyone else out there who has gone through something similar. 

Thanks