I have a few thoughts. What do you believe about yourself to think you need this persons acceptance or support? Figure out what that belief is and challenge/deconstruct. It may be self worth. I also did an exercise in an abundance class where we imagined that we had failed and we were squirming on the floor with all the people who didnāt believe in us pointing and laughing, saying see! You failed. In that course the lady recommended then letting those feelings that came up really get felt and letting it go.