Possible Duplicates:
Is “guy” gender-neutral?
What is a feminine version of 'guys'?

Almost of my fellows are male, so I usually say "See you man" or "Guys, I have some problems and need your help". It seems very strange if I use those sentence with my female friend. I want to know, can I use "man" and "guy" in this case? If not, what should I say?