Hello- Thank you for asking the question here at JustAnswer. I have read what you have written and am happy to respond.
There are many sexual positions that can bring satisfaction to your partner and obviously, your husband prefers this position and you have had difficulty in satisfying his desires. This is not an uncommon problem and one that you can work on togetherl.
Also note that he can also work on things that may bring greater satisfaction to you .
The most important thing to realize is that sexual interaction issues almost always have some foundation in anxiety. whereas, you are so worried about pleasing that you cannot relax enough to make a give position work. There are a number of exercises you can do to increase strength. The following link with explain exercises and process in detail:
I also recommend this book by Christopher and Rachel McClusky: "Enhancing Sexual Intimacy in Marriage"
Also, the classic by Alex Comfort: "The Joy of Sex"
I trust that this has answered your question and wish you the best.
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