My psychological suggestion is very strong. When I was talking, I saw someone laughing or whispering below, and I felt that I was talking about my poor ability or other bad things.

In fact, many people have your situation, but it's no big deal and can be changed. First of all, because you are not confident enough, you always feel that what you are doing may be wrong, so you pay special attention to others' evaluation of your external performance. As you said, you feel that someone is laughing at you when you speak. In fact, this is just your personal psychological activity. You should know that if you give a speech on a large occasion, no matter how vivid your speech is, there will still be people laughing and joking below. Their conversation has nothing to do with you. Maybe they are not very interested in what you say. Everyone has different hobbies, and there is no way to force them to listen quietly. Others may be angry or disagree with what you said. Discussing it below doesn't mean laughing at you. To be fair, when you hear something, you may also have different views on the same thing with the speaker. Your situation needs a long-term improvement process. First of all, you should put yourself in the other's shoes and think of yourself as an audience listening below. What do you think of the same content? Secondly, you can't ask everyone to be qualified and listen to your speech quietly and seriously; Also, we should read more books on philosophy, broaden our horizons and broaden our minds, so that we will not be entangled in this issue all the time; Finally, you should exercise more and speak in front of everyone. Don't care too much about the people who speak below. Try to give psychological hints and tell yourself: it's not that you are not good enough, but that someone's quality is not high or my speech is abusive. You will find that gradually you can be indifferent to the reactions of the people below. I hope you can succeed soon!