Andy you are holding back your own progression trying to learn on a shortboard. You aren't getting any younger. Get a 9' longboard, you will catch so many more waves and learn how to surf so much faster and have much more fun in the process.
One of the advantages of a long board is that it allows you to catch waves early before they get steep and hollow. I will surf a longboard in close-out dumping shore breaks since it allows me to get a good bottom turn and top turn/floater on the unbroken face of the wave before it breaks. If I try to catch the same wave on a shortboard or fish I will catch less waves and I have to catch the wave when it is steeper and about to break which is much more difficult since you have way less time to react. if I make it to my feet I rarely have enough time for a decent bottom turn let alone a top turn before the wave breaks all around me.
Longboard = higher wave count = faster progression
Shortboard = low or zero wave count = Slow or no progress.
W-Chan laid out the perfect progression of surfboards for a beginner, its great advice, he is a surf instructor and competition surfer. There is loads of good advice in this forum if you are willing to listen.