Maybe it's because these are people you've never met in person? Emailing a stranger is one thing; talking on the phone is getting more personal.

If it's the internet thing that scares you, probably other ways of meeting men are going to work better for you.

Or perhaps you're not really ready to start dating?

Maybe you could pick just one -- the one you feel most comfortable about -- and set up a coffee shop thing? via email, and see how that feels. Just as an experiment. Doesn't have to go any further.