I’m not introverted, shy, or socially awkward, I just never know what to say

Does anyone else feel this way? I’m not necessarily afraid of social situations, it’s just whenever I’m in one, my brain freezes and I can never find anything to say that would contribute or add to a discussion other than “that’s crazy” or “that’s cool” or “that’s hilarious”, etc.

Like whenever a group of my coworkers are talking, everyone seems to make witty, well-versed comments whereas I’m just the outlier wishing I could join the conversation with my own thoughtful comments but I just can’t. Maybe I’m just not interesting? Or just plain stupid? I don’t know.