I am the same, I can barely say anything without feeling stupid. I honestly don't know, I mean, I always think back on that stuff, like when once, in youth group, we got a question about the Bible, from a teacher, and a guy asked me if I understood, and I heard "Do you understand guys?" instead of "Do you understand this?". So I started answering like this "Well, yeah, I do, I mean, I hang around guys too much! Especially here! (since I'm the only girl), I mean, I understand you, and, ", and he interrupted me, and said "No, do you understand the question?", and when he said that, I knew I was blushing, and since I understood the question, I said "Well, yeah." and I started explaining to him. I still feel so embarrassed. If you wait a little bit, you'll start worrying about other things, or maybe not worry, and feel excited about other things, it might not get off your mind, but you won't think about it that much, don't worry. I experience embarrassments a lot.
I hope this helped!
~ Your friend, Wraya <3