Development of breasts, getting more stomach fat, feeling tired, loss of muscle mass and emotional disturbances is what some of the things are. You don't just grow boobs and get less hair. Also, it's very risky, health wise - your bones get weaker, causing them to fracture more easily.
Um, read the profile, I'm a woman. Being on estrogen, aka. birth control pills, is kind of a natural thing and it doesn't affect me in the way it would you. And if you really wanna know what it's like to be a woman, it FVCKING SUCKS. Periods, cramps, sore breasts, mood swings, perverted men everywhere - be happy you're a guy, you got it a whole lot easier than women do.