I've just joined a group - not yet attended.
I think mine is held on the first Wednesday of every month and just joined - I waited a while before joining as it's via NAS so they had an application form that required a photo and references, also because I have the same fears as you.
I want to attend because I'm unemployed and have been for three years, because of this I get pretty much ZERO social interaction, it's making me go backwards in terms of problems with asperger's, it's making it harder to ger back into work, generally effecting my mental and emotional well-being. SO for me a support/social group would potentially be somewhere to interact with others, to hopefully make new friends which I very much want right now, and it may be a point where I can get advice or pointed in the direction of support to help with the various issues I'm having right now with finding work.
Plus - I don't have an official diagnosis yet, I'm very much stuck in limbo until I get the diagnosis I'm told is now just a formality, I'd like to meet others to see how I compare with them, to gauge how 'bad' I am and also because they're having a bit of a hard time determining if I'm actually asperger's or autistic so I figure understanding both more would help. Having gone most of my life without even knowing about autism or asperger's connecting with others was like coming home, so getting to know others will also hopefully help me feel a little more 'normal'.
I'm not sure what the people there are going to be like, if they are going to be like me or...it sounds horrible, but...if it's people who are more severely autistic than me as I don't think I'd want to socialise with them. I mean this as no offence, I worked with severely autistic people, I have dated an autistic person who was worse socially than me, it's just it's tough enough for me right now I don't want to have to work extra to help other people get along with me. Maybe when I'm not having such a hard time, trying to fit in with people who aren't like me is just too much right now.
I wonder how I'm going to get on the first time as I don't think I'd be able to bring my boyfriend with me, it's a new-ish place, and new people - I'll have to be brave. It's held at my old college (they go out to restaurants, pubs, bowling, etc. too), I went up there a few days ago to enrol in a part-time course and found they have a new student support department that actually supports students with disabilities (I wish it was like that when I first attended that college!! !!) and I even got to meet an autism adviser who will help me in college...so the fact they are more supportive to disabled students, even if it's not the same people as those who run this social group, means I'm a bit more at ease with the whole thing.
I'd go very much with 'give it a try' because it might be helpful to you, if you go in and find it's not for you then you can leave...you don't fit in...they don't fit in...if you don't fit in all together it's not a problem with you, you and them are just too different. If you can forgive not fitting in with anyone then it's with other social rejects 