Women have this wonderful thing called "menopause". As soon as you hit that, say goodbye to your lovely body. I don't think even working out will save you there.
And if you choose to remain single, be prepared for alot of "Oh, are you sure?" "Oh no, what happened!" "Are you absolutely sure that you don't want to have children?" Along with all the deep rooted sexist attitudes in society, meaning that in whatever given task you want to achieve by yourself, you won't be given the same amount of respect as a man would.
Isn't it a joy to be born a female.