I struggle with anxiety and strong worries(

I’m 19. Pretty often I feel perplexed and I guess people can control my feelings and emotions. Speaking in front of huge audience always scares me. I think what people are going to say or think about me. I’m a student and even during the classes I feel insecurity, I am afraid to say something and I can know the right answer.

I don’t know guys probably someone has the same problem, how you deal with it?