How do you turn down a guy?

I'm just really bad at rejecting someone with anything in general. And when I do say no to something, I feel bad afterward and change my mind most of the time. So to the question, when a guy asks you out, how would/do you turn them down? And for guys, if you were to get turned down, what's the best way for a girl to do it?

I couldn't bring myself to say an outright no, so I do something my friends say is horrible, I can't help it though! When a guy asks me out, I smile/chuckle and then talk about another subject... Help?
How do you turn down a guy?
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