It is interesting. Two people can go to the same guild and come out with entirely different perspectives on the guild. Even the same person going to different meeting of the same group can have different experiences for each meeting. Life seems to be like that a lot.
If you tend to be shy then you might want to take a class or 2 at a LQS so you meet some quilters in the community before going to a guild. Maybe a classmate belongs to a guild and can meet you there or help you get to know others.
Most LQS's know of various quilting groups in their area and can recommend some to you.
I met someone in a LQS who told me of a quilting group and encouraged me to go. I did and I love this group even though at times I do get frustrated with some things that happen there. I have met many new friends and we share our love of quilting with each other. We also support each other in our non-quilting lives.
I did contact my state quilting guild and got a listing of the various guilds associated with it in my area. Too funny in that one representative of a nearby group flat out told me I wouldn't want to join them before I could even introduce myself or ask any questions. Needless to say I never even went to that group. I have heard they have since disbanded. Hmmm.
I sincerely hope you find a group that you love and can grow in.
ali