Sometimes there is no substitute for face to face interactions with other people. It's easiest to understand the moon rotation thing if somebody demonstrates it to you. The header says you are in Cork, Ireland. So I suggest you contact the Cork Astronomy Club. This is one of the things that amateur astronomy groups are really good at. You can learn a lot about this, and all manner of topics in astronomy, through personal involvement in an astronomy club or society. So I suggest you take this problem to them and they can show you how it works.

And don't think you should be embarrased about "not getting it". In fact most people "don't get it", and your question is a common question. I took part in a workshop some years ago where we as astronomers taught elementary school teachers about the rotation and phases of the moon. It was not an easy task; we were teaching teachers, not students, and at the end of the day we still had a couple of teachers who still had problems with it. So in fact it really is harder for non astronomers to understand the rotation of the moon than it is for those of us who are more involved in astronomy.

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The point of philosophy is to start with something so simple as not to seem worth stating, and to end with something so paradoxical that no one will believe it. -- Bertrand Russell