is it normal for prof to point out ‘why are you making that face’ during group conversation when others are asking questions im just listening

So today after the test, i was with my friend discussing question and we went to prof, and he was with other people discussing stuff and she started asking questions too, i was just listening and nodding not saying anything because i knew i did everything wrong, and prof pointed out by making this face and expression😖😐🤷, while he seem friendly doing that, he said why are you making that face, what happen and i think he also said did you do something wrong (not too sure) , i started explaining that i think i did that question wrong and one thing in the other question, he said what do you mean thing, and then i clarified. I am socially awkward idk if i give off that energy though maybe maybe not. i am also not like a teacher’s pet, and not very smart, other people asking were kinda nerd (not in a rude way, they’re really smart), anyway this prof also look at me so much while in the class and it creeps me out, im the person who gets thru the class and move on, bad but this is how im

But is it normal for prof to point out why am i making that face, do i look stupid or dumb or do i give the vibe that i dont understood something ??