Pleasure classes are for those sweet horses that aren't really super at any of the normal divisions, but are good mounts just the same. Smile, that will really tell the judge you enjoy riding the horse. Short Stirrup, Long Stirrup and Rusty Stirrup are all 2' divisions and usually the starter division for most riders. Remember at a show you usually go down a level, because the pressures of showing are going to cause a ton of problems, so it makes it easy because the classes aren't intimidating. I feel you on the embarresed part because for the longest time I had nothing to show on that could jump bigger, so I was stuck in lower divisions. I had plenty of horses I could do more on at home, but not ones I could take to a show. I finally got blessed with (I won't say better, because no one was better than the horse that taught me fundamentals) bigger jumping horses later in my teens. Good luck, have fun, smile, and in hack classes make sure to pass in front of the judge as often as possible and not get lost in the crowd.
Troubled TB ~"A thorn by any other name will prick just as deep." @-'--,---