I recommend taking any martial art, it's better than nothing. It's a gateway to other arts and you can find out which one fits your personality and style the best.
Most people aren't going to be seeking the MMA championship title, so being the biggest badass in the world isn't that important.
It's good to be able to defend oneself and others, but martial arts also develops your sense of self and well-being. You don't know what you're missing until you attain that.