What am I riddles

When you have me, you feel like sharing me. But, if you do share me, you don't have me. What am i?

I go in hard. I come out soft. You blow me hard. What am I?

When you don't have me, you want me, but when you do have me, you want to give me away. What am I?

What comes down but never goes up?

I have keys but no locks. I have a space but no room. You can enter, but can't go outside. What am I?

I have no life, but I can die, what am I?

I visit you every night even if you don't call me. I'm lost every day. What Am I?

I had no father, only a grandfather. I shall bear no sons, only daughters. What am I?

I am small. I can be scary. I have eight legs. I spin a web. What am I?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth I am dissolved into air. What am I?