I'm a Taurus, and while I don't really believe in horoscopes (well, I read the one in the newspaper occasionally, just because it's funny, and that's it), I looked up some character descriptions up at the time when everyone was talking about that 13th zodiac, and actually, it turned out, the character description of Taurus almost fits me perfectly. According to that thing I would be an Aries instead by the way, which doesn't fit me AT ALL.
Anyway... Well, I think being a bull is a lot more badass than most of the other things, and if on top of that it fits my personality, what's not to like?
And no, I wouldn't like to change it.