Just laugh it off! I've fallen off many times (horses and ponies!). And hey if it helps you any I have always been told "it takes 7 falls to be a good rider"! I mist be a total expert by now since I have lost count of how many times I've fallen off. Haha. But don't let it get to you, you are NOT the only person who has ever fallen off of a pony!
Someone on here said it best, "If ponies were human they would all be in jail"
In all seriousness, falling off is part of the game, and as others have noted, most ponies have short strides, fat bodies, and low balance points and experiencing and learning to ride the different body types will make you a strong rider, so just enjoy the experiences :)
Nothing to be embarrassed about, ponies are the trickiest! They're so tiny they can just wiggle all over the place and quite quickly too. ;)
I fell off a pony I was schooling at a horse show a few months ago because she decided at the last minute to run out of a jump xD
I don't really have any suggestions besides get better fitting tack! I see some other people here had some good ideas.
You guys are all wonderful! SInce this incident, I have been working on trying to ride Payson bareback, which my instructor is hesitant about since no one has ever rode him bareback, we just don't know how he'll respond. Since though I have been reading so much about training! SO INTERESTING!! And Payson is practically a different horse due to all I've been reading! He's just a big dog :)
Ponies are evil :P the one I used to have was a horrid bucker, wouldn't jump, and had a nasty habit of dropping a shoulder, shying violently, bucking, and then taking off in the opposite direction. Evil little monster. I trained him out of the bucking, and taught him to enjoy jumping, but I never got him past that last thing.
Keep at it though, if you can ride a pony you can ride anything!