in a slump!

i feel in a funk, in a slump, in the pits...whatever you want to call it...i should be very happy but im not...why? it doesn't make sense...im doing what i like and getting paid for it...i have great co-workers, im passing all my classes, ive got a house...what is wrong with me? I feel like im going deeper and deeper into a well and i can't get out...i try to stay the funny, crazy person that i always am but it concerned me today when the reading coach (my boss) said to me: "whats wrong? you have not been yourself lately." AWWWWWWWW!!!!