MineCraft Taming a Horse With Nothing?

Keep trying to stay on the horse until hearts flutter out. Then the horse will let you ride it. But you need a saddle to control the horse, otherwise it won't listen to you.

You need a saddle otherwise it won't move
you can craft it out of leather
it is true that you can tame a horse just by sitting on it, but like you said, it won't move which is why you need a saddle
hope this helps.

You can only ride a horse with a saddle, which you find in chests and stuff.

To tame a horse simply keep getting on it by right clicking with an empty hand, the horse will keep throwing you off, keep trying until hearts appear and it will no longer kick you off.

To actually ride the horse you will need a saddle, a saddle can't be crafted, it must be found. You can find one through these methods:

Naturally generated in chests inside dungeons, abandoned mine shafts, Nether fortresses, desert temples, jungle temples and in blacksmith chests in villages.

By fishing (rare find)

Villager leatherworkers will sell saddles for 8-10 emeralds as a third tier trade.