Here's why:

* Gravity is a force of attraction between objects with mass. The more mass an object has, the stronger its gravitational pull.

* Small objects have less mass than large objects.

* Therefore, small objects have weaker gravitational fields than large objects.

Think about it this way:

* The Earth is much larger than you are, so it has a much stronger gravitational pull on you, keeping you on its surface.

* A small pebble has very little gravity compared to the Earth, so you don't feel its pull.

It's important to note that even small objects have *some* gravity, just a very tiny amount. But it's only noticeable when you have very sensitive instruments or are dealing with incredibly dense objects like black holes.