AA Meeting Members Get Upset When I Don't Share

After years of abusing alcohol, I joined an AA Meeting about 4 months ago. I attend at least 4 times a week. I feel like it helps me hearing others' stories. But ever since I've been with this group, I get pressured into speaking or "contributing" is what they call it. I've spoken maybe twice since I've joined.

I don't like to share because I have PTSD. I was in the Army for 6 years and did 2 tours in Afghanistan. It's one of the main reasons that made me begin drinking. So I don't like talking about the things I experienced over there. Yesterday was the worst because after yesterday's meeting, one of the members yet again approaches me and tells me that I need to share because it's pointless attending but not sharing.

At today's meeting, the topic was about contributing in the meetings, and for the entire meeting I just felt attacked. So now I don't want to go back.

Am I in the wrong? Should I talk more at meetings? I just don't feel welcomed there anymore. Thanks!