What should I do to show my fiancee that I am man?

Hi everyone I had ago an inconvinience with my future father in law and mother in law in front of my father two days ago. During the marriage petition I wanted to talk to my parent's fiancee for authorization to marry their daughter but I was so nervous in front of my parents and her parents and when I tried to talk, I couldn't. I was so nervous that nothing came out of my mouth and her father said "come on, I don't have all your time!" and I only said " I can't talk" "I can't talk" and and my father said "David, don't be so coward! say what you have to say" and I said " I am so nervous I can't talk" "sorry for this situation all of you" and my fiancee said " come one honey, you can't make me this, I thought this was going to be romantic" and her father stood up and said "okay boy I know what you want to say" , and "I accept your intention of asking for permission to marry my daughter" , then my fiancee's mother proposed a toast and my parents and her parents knew each other, me and my grilfriend were having a conversation about our relationship, and she said that she doesn't want to be married with a coward and that I need to demonstrate that I am a man. However, she said yes to me. I don't feel okay about what happened two days ago, so I want to do something and I feel I'm not a man enough. What do I do now? How can I feel better?