A Triggering Situation

I want to reveal a situation that has been upsetting me recently. It involves OCD, triggers, and social situations. This happened 2-3 weeks ago. I had joined the UNF Sociology club. I joined so that I could make new connections with people. When I walked in for the first time, a guy assumed I knew this woman who was in this club sitting nearby. I said I don't know who she is. Then the woman may have said, "you don't know me?" But I don't remember. Then later, that same guy came up to me and apologized for assuming I knew who that woman was. I don't recall anything he said after that. I think he was explaining why he did think I knew her. I wish I had assertively said at the time, "It's my first time in this club and we never seen each other before so why would you assume I know who she is?" I feel like if I said that then it is evidence that I am capable of advocating for myself and being assertive as well. I already talked to my OCD therapist about this. I have temptations to go back there on Tuesday just so I can complete what I need to say and then leave early (to perform a compulsion). I recognize that if I went back to bring this up again, he would likely react very confused and may think I am weird. So I would try to modify what I want to say to make it seem less odd. I would say, "Hey I remember you and you just reminded me of something that struck my curiosity. It struck me as odd that you assumed I knew this woman even though It was my first time here and so we have never seen each other before. Why would you think I knew who she was?" And when I say this I hope that woman would be a witness to what I said as well. Then I will feel satisfied. But this is something that I really feel uncomfortable doing. I only want to do it so I can relieve anxiety after it's done. This situation triggered a cascade of thoughts regarding if I am capable of advocating for myself and if I am assertive enough. It casted doubts. So I performed a mental review of situations over the past 7 years of when I did advocate for myself and when I feel like I did not in order to check to make sure I am good or not. As you can imagine it is distressing because it made me think of negative situations when I think I could have advocated for myself more and it really upsets me a lot so then I try to think of situations when I did try to advocate for myself in order to counteract those situations when I did not feel like I did enough. By the way I stopped attending the UNF clubs because of too many triggers and because I feel like I don't relate well to the students there. I will be attending grad school this year and I think that will be a good opportunity to meet older students who will be more mature and I think I will relate better with them than undergrad students.