Pete said a while ago
Spoiler "if you think you are the only one who can use dragon shouts, you are wrong"
But i can't remember where he said it now.
I remain skeptical until you can come up with a source. You're the only dragon born. You have to be dragon born to speak the language of dragons. If it's not the language of dragons, it's not a dragon shout. The Nords use shouts, but they aren't dragon shouts, they're Nord shouts (Thu-um).
For more about Thu-um, see the Oblivion in-game book: Children of the Sky. See here: http://www.uesp.net/wiki/Oblivion:Children_of_the_Sky
If you read that, you'll notice that the magical powers of the Nordic voice are described as being sort of like the spells of Oblivion, though with some exceptions. They can sharpen swords, push enemies away, make them afraid, etc. I suppose they can also cast charm spells, detect life spells, invisibility spells, and some other useful spells too. And best of all, it's all done with the voice so that they can conserve their magicka for healing purposes.
Dragon shouts are different. With dragon shouts, you can encase your enemies in ice, breathe fire, or call down a bolt of lightning to shock your enemies.
Hopefully, the difference between the two is now clear. Dragon shouts are on a whole different level altogether.