One more time: You do not look feminine. Even if you did, the shaved look makes you look more mature and manly. I'm 19, and have always felt like a little kid, and saw myself as looking younger. So it surprises me when people mistake me for being 24.
Besides, you can try doing it gradually. And don't ask for permission, just let them know so they won't be in such a shock. Your family will get used to it, mine did.
Take note of Bald Hobbit -- he speaks the truth. You looking feminine is just BS and if we use a BS meter it will show:

in relation to looking feminine.
Breaking Bad makes baldness look so cool -- I bet HeadBlade sales skyrocketed when the series came on. I've seen it online somewhere dubbed into German.
Spüren Sie die Freiheit der ohne Haare