How do I stop this weird feeling?

I feel *numb* emoinally ..... i can be hanging out with my friends and i often feel out of the equation, as if i am not there with them as i once was. Or i can be doing something that most people think would be fun (as would I) and i just cant seem to enjoy myself, i just observe the ocassion as if i am narriator of people around myself. I havent fallen in love or crushed on anyone ... it seems the only thing i can do resently is work on school work and clean .. i feel robotic and i cant break out. How do i stop this madness?