Medium who am I riddles for teens

Everyone in the world break me when they speak every time. Who am I?

We are a family of 12 members. I am the second. I am also the youngest in our family. Who am I?

I have all the knowledge you have. But I am small as your fist that your hands can hold me. Who am I?

I am as big as you are, but I am weightless. Who am I?

I am the building with number stories. Find me who am I?

I am a 5 letter word. Take away the first letter and I am a country's name. Take away the first two letters and I become the opposite of the 5 letter word. Who am I?

I am there when you are quiet. I am broken when you speak. Who am I?

When I look at her, she smiles at me. When I wink at her, she winks at me. When I kiss her, she kisses me back. When I say I love you, she says it back. Who am I?

I soar without wings, I see without eyes. I've traveled the universe to and fro. I've conquered the world, yet I've never been anywhere but home. Who am I?