What Am I? Riddles

I’m lighter than a feather, but the longer you hold me, the harder I am to keep. What am I?

I’m named after nothing, though I’m awfully clamorous. And when I’m not working, your house is less glamorous. What am I?

I’m not a bird, but I can fly through the sky. I’m not a river, but I’m full of water. What am I?

I’m not at all heavy, but even the strongest man in the world can’t hold me for long.

I’m not clothes but I cover your body; The more I’m used, the thinner I grow. What am I?

I’m red but I can be green at times and I am even yellow. What am I?

I’m simple for a few people. But hard for them to hear. I live inside of secrets. I bring people’s worst fears. What am I?

I’m smaller than a mouse, but I can fill a whole house. What am I?

I’m so fast you can’t see me, though everyone else can see straight through me. I don’t stop until the day you die. What am I?

I’m tall when I’m young and I’m short when I’m old. What am I?

I’m the manly mark that milk makes. What am I?

I’m under your face, I’m outside your mind; A biological case, Pressure brings pain sometimes. What am I?

I’m where yesterday follows today and tomorrow is in the middle. What am I?

I’m white, and used for cutting and grinding. When I’m damaged, humans usually remove me or fill me. For most animals I am a useful tool. What am I?