Anxiety and lying when someone criticizes me or is mad at me

I get extremely terrified to the point where I lie obsessively to prevent people from getting mad at me or to postpone a troubling or hard conversation with someone, usually a family member or my bosses.
I have had 3 small anxiety attacks this past week alone from thinking about my boss potentially getting angry at me for not working hard enough or doing something in a way he didn't like, but I don't want to talk about this anxiety with him because he will think I am a 'pussy' and I cannot absolutely not quit my job or get fired!

What do I do about this? The lying is also not helping at all!