irrational mood swinging

My life is insane. Everything's perfect. Quite literally. My family is perfect and functional. I have friends who are amazing and a boyfriend who is fantastic (as a complete understatement). I'm doing insanely well at uni. But I've become a perfectionist and I hate myself for it. I feel like that I'm not good enough for what I want to do and it's crazy. I place an insane amount of expectation on myself and it's just a vicious cycle because I end up doing work that isn't as good. Maybe it's some weird hormonal thing. But I've never felt like this - so stressed over relatively nothing - in my life. It's quite literally nothing. At least it's nothing to worry about at this exact point in time. Yet I worry. And I'm pissed off because I'm worrying. Gah!