proof that girls are crazy

so, i don't know whats wrong with me, but when i spend too much time by myself i can convince myself of anything. the past 2 days i've been done with class and everything by about 2:30, and from that point on have had nothing to do. so both days i came back to my room, played wii for a little bit, then took extremely long naps, which is weird, cause i don't nap. but yesterday i took a 4 hour nap! which for me is HUGE! and then, idk, just so much time by myself my thoughts have been going haywire. i can easily convince myself of things like somethings wrong with my relationship, or i have no friends and no social life, or that people are mad at me when they're really not. and from a rational point of view, none of any of these things are true, but for some reason lately i've been left feeling really alone and depressed. like, i got in a fight with dave on sunday night, and we went to bed angry which really bothered me, but by early monday we had everything completely resolved, and things have been fine after that. but for some reason i can easily tell myself something's wrong and we're gonna break up and all of these things, when the truth is nothing's wrong and everything's perfectly fine. but why do i do this to myself?? sometimes i really feel like i'm going crazy :(