Suggest Treatment For Itching On Thighs,buttocks And Pubic Area

My thighs, buttocks(No longer anus), most recently my pubic area(thank GOD not my penis) and stomach are itching. It always seems to be more intense during sleep, and most intense during showering. I am a virgin.I just recently changed my bed sheets, they were used, even though my anus was itchy before I got new sheets. I do a lot of home sitting, though I m not out of shape n t obese. The weirdest thing is that there has been no skin discoloration, scars, scabs, or rash, and this has been going on for 3 weeks. Can someone please help me I start school i n 2 weeks and I would much appreciate it if someone could save me the embarrassment. I m African-American by the way; if that would help you answer my question Thanks Doc