I've been refusing to hang out with girls lately, because I don't want them to waste my time.
Why would girls waste your time?
I don't want to end up being forced to marry a girl who is too fast.
Well, you won't know about someone until you talk to them. It's not right to assume a girl is just wasting your time.
I don't need a girl to talk. If I just want to get laid, a hooker will do.
Just because a girl doesn't want to have sex right away, doesn't mean they're wasting your time. Do you think your male friends are wasting your time when they just hang out with you? This could be considered pretty sexist and most women won't want to even have sex with you if you continue thinking so lowly of them.