I am struggling a lot these days while presenting in front of my supervisor. I make many mistakes, sometimes very stupid mistakes, and he is now saying, "You need to avoid these mistakes." I am not able to focus on theorems, lemmas, etc. but instead focus on things like how to avoid mistakes in front of him. Many times I feel nervous in front of him, sometimes sweating in front him due to nervousness. Although he tries to make me calm but also give strict feedback.
The one question that makes me worry is that he knows the things I am presenting in front of him, but he doesn't try to clarify things. To me it appears that he creates confusion in the proof that I try to present.
Question: Is my supervisor making things clearer or confusing?
On the comment of @Magicsowon I am going to add a detail here. When I discuss things with him he asks, "What is this?" Now the problem is there can be multiple definitions of the same term. Then I often assume the wrong one and do the proof. In the literature I follow, things are not defined in a good way so most of the time it happens that there is a confusion on concepts.