The Small Horse Identity Crisis Question

Hello there folks! Many of you will be aware that I have recently been pondering the following question:

Does a small horse ever have an identity crisis and wonder if it's actually a pony?

Or, on the other hand:

Do large ponies ever have identity crises and think they're really just very short horses? (In which case, do they get angry?)

However, the darling Amanda informs me that the only difference between a pony and a horse is the size*, apparently above the size 13 3 (I think this is in hands, but I'm not sure, she wasn't very explanatory) makes the animal a horse. So now my question has changed slightly:

Would a horse which was borderline pony-size consider itself a very tall pony? And if so, would it then bully smaller ponies and try and reign over them like some sort of King Pony? After that, would it eventually move on to try and take control of groups of larger horses in a sort-of Napoleonic way? And can we really survive another Napoleon-esque emperor? Especially one that's actually a horse and might not be sympathetic to human customs, or might even take out revenge for all its ancestors and their mistreatment by humankind? 

Oh the humanity!

Can you imagine how horrible it would be for that small horse/tall pony though? He'd never feel like he belonged anywhere; he'd be too tall to be friends with the real ponies, but he would be laughed at by the taller horses for him diminutive stature. How cruel would that be?

To be honest, there's a bit of a philosophical query here: should you want to be the best in your social group, or should you want to be the least educated and qualified in the hope of bettering yourself by being surrounded by those greater than you? I prefer the latter; a quote I try to live by is "If you're the cleverest person in the room, you're in the wrong room" - this is sometimes too difficult to judge, as lots of people are clever in different ways, but if you know more than everyone else in the room, you should probably try to move in greater circles. Unless you're a teacher, in which case you should be the cleverest person in that room. But even then, that's not every room.

*(This makes me wonder if you could actually have a Shetland horse. Because I really want one now.)