I'm a member of 4 guilds (one doesn't meet very often or nearby, so I haven't gone to a meeting - just paid dues - it's a statewide guild that's in trouble but put on a great show 2 years ago). I have not had an issue with any of them - but I don't know that all my acquaintances can say that.
I am a rather outgoing person, so I'll just chat people up when I feel the need to. Don't be put off by one group that may not be welcoming - keep looking for a group that will be friendly and accomodating. I'm sure there's one near you.