Why do brains think so much?

This last month + has been uber annoying for me, all i can do is think about Rebecca and various scenario's which might occur, some are good and some are bad, but whatever it is all i can do is think about her, well unsurprising because i think she is one of the most amazing people EVER! i really love Rebecca :D and well even though my brain does think alot and its annoying.. i'm glad im thinking about someone so special.