Easy who am I riddles for teens

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

I eat other animals. I have a big mouth. I am green. I live in the water. 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?

Slayer of regrets, old and new, sought by many, found by few. What am I?