Chillgal,
Alanon is a very loving bunch, but I don't think you need to worry about being hugged if you're not comfortable with that. People will try to make you feel welcome. The hugs come later, if that's your thing.
The best part of being at an Alanon meeting is the feeling of being around people who understand what you're going through.
If tonight's not the night, that's okay. Maybe the next time, yeah?
Gabe