I don't feel comfortable in my own skin?

I always feel numb, and then waves of numbness overcome my body even worse and get these 'spasms'... it's weird. And I always feel itching under my skin like I'm trying to break out of it. I always feel tired and time seems to be moving so fast. Sometimes I just want to get in a car and go 100 mph and keep going till I can't go no more. I even wanna just leave everything behind and travel across the US on foot because I just want to get away from it all. what's wrong with me?? Help!!