First, I want to give you a hug
Second, I want to tell you I can relate to this.
Third, I want to say is don't give up trying. Whenever you're in doubt, re-focus back on your strengths. Identify them and then stop. Don't think anymore. Stay on those thoughts for a moment and remember them. That's what I do when I'm nervous about my skills. I have to make myself believe in them or else I can't confidently express them out.