Because you are judging all those books by their covers.
You have humans, which are awesome. They are just like us, but us if we had to learn to survive and thrive in worlds with undead, demons and dragons.
There's near-immortal wild people who are awesome archers. Those who left the wild built crazy beautiful civilizations utilizing their long lives and really old civilizations. They have trouble relating to other races because they seem like children to the old elves, but at the same time elves are stuck in their ways and don't always see the forests for the trees.
There's the people who live in the mountains, they are small, but they are tough and heavy like boulders. They work very hard, they fight very hard, they drink very hard. They are honourable, loyal, and don't ever forget their own history, no matter how many goblins, orcs, and giants come to their doorsteps. Don't talk to a dwarf like you know the meaning of family or hard-work or adversity if you aren't one. And yet, they still survive and generally act awesomely.
There's tiny humans. Yeah, I agree these ones aren't great. They are always river gypsies, hobbit rip-offs, or basically city-slum pygmies.
...actually, on second thought, they aren't bad.
Then there's the little people with big heads who pull pranks, create amazing inventions, and love entertainment. They may not initially like you. In fact,they may initially fear you and your kind. They are a little skittish of outsiders. But if you can win them over, you have a hilarious, super-resourceful friend for the rest of your life.
Then you have the tusk-toothed, brutish people from beyond the frontiers. They are what you get when you take fearsome berzerker raiders and make them twice and strong, twice as tough, and they have monstrous, beast-like faces. And worst of all, they hate you and and see no need to keep your silly cities intact or any of your family alive.