Orgasms ? Help?

Brittany • •Wife💍•Mom dog of two fur babies🐶💙Cheyenne 🐶💙 Chevelle •👼🏻👼🏻🌈

I don’t think ive ever had one before and last night my husband and I were intimate and my whole body was tense and I was twitching but he says I was holding back my O

What am I doing wrong? How do I let go?