I have just come out. What did I do wrong?

I am nearly 26. I have been an intensely devout conservative Catholic for the whole of my adult life until now. I am an atheist now and I have come out to family and close friends. For several years tried to change my sexuality through self-help books written by reparative therapists. I have suffered a lot due to this homophobic and oppressive mindset.I am a virgin. I don't have any gay friends, except the ones I met through an exgay organisation. I called an LGBT charity helpline recently and they were really helpful. I am going to go to their group in a nearby city, but I can't for a few weeks because of my studies.I don't know what to do. It is a really exciting but also daunting time for me at the moment. So I thought I would go to an event at my university's LGBTQ+ society. I have never been to one before. It was a postgraduate and mature student meet-up in a cafe. I turned up and there was one other man there, who is the LGBTQ+ society's postgrad/mature student officer. The rest were women, about five or six.When I turned up I got an immediate feeling I wasn't welcome. One of the women gave me a perculiar look, but I can't figure out if it was hostile or just awkwardness or discomfort, or me imagining it. From then on nobody spoke to me. Nobody even maintained eye contact with me even. I am not sure why this is the case. I am a reserved person but I think I have good social skills and I can talk a lot. The other guy did talk to me a couple of times, like where are you from? What do you study? But it didn't go very far.I tired to ask questions and butt in to the conversation every so often but nothing came of it. I am a bit confused. Why was this the case? I look and appear heterosexual, my hair, clothes and manner of presentation are masculine I suppose. I am worried they were offended by this? The other guy there was feminine but this doesn't bother me at all in the slightest, neither does socialising with lesbian/bi women. I just wanted to get to know some more people and make my current situation more normal.I don't know how to be gay. It must sound like a stupid thing to say, but I don't know where to start. What did I do wrong at this group? It appears to me they were either really intimidated or have poor social skills. It must be one of those two things. I can't imagine they disliked me, they had never met me before!