Lost my third fight please help

Just experienced my first loss over the weekend. It was also the first fight my family came to watch. I didn’t get hurt at all, and I’ve been told it was close (I personally don’t think so), but I’m really ashamed of my performance.

I was faster, stronger, and had better cardio than my opponent, but I basically threw the fight away by not trying hard enough. He was 37 and I’m 19, yet I let nerves and hesitation control me the whole fight. I fought too passive and never really let myself go.

What hurts the most is that I had so much energy left afterwards and took no damage. I just didn’t want it enough in that moment and I’m trying to figure out why. If I can’t figure that out and fix it I know that no matter how much training I do I’ll lose the same way or worse next time.

Has anyone else gone through this being physically prepared but mentally not showing up at all? How did you get past it?