How do I stop my soul crushing/negative mentally?

I can't stop thinking about how i was born into an awful, unfair, no-good world. If you look into space, you see a beautiful earth tainted with people. We have caused so many soul crushing issues to this beautiful world... and for what? Green imaginary money? A made up society? made up wars? made up jobs you have to work for till you die just to make billionaires richer? We as humans did this for no reason but ego. We could have all lived as a community and worked together.. but we didn't. im mourning a nice life full of freedom that I could have lived in. I was forced into a world I had no say in being here or not. I don't have a say in my own life. And now I have to deal with the consciousness of people generations before me I had nothing to do with. it's SUFFICATING.

I love fiction. Because in fiction, they can make the world a better place. in fiction, there's hope for a better world, in fiction, life isn't mundane. in fiction, good wins, and evil loses. In fiction, you can actually do something about wordly issues. I will never see this type of hope in real life. Because of this, I try my best to indulge in fiction and daydream to escape this place. But when my brain stops daydreaming, I get extremely sad. I wanted to be there just for a little longer. I love creative hobbies, but I've come to realize that it's hard for me to create because I don't want to create fiction, i want to be in fiction. This slow jealousy i have for fictional characters has made me have distain in my creative hobbies.

I just don't want to live this life anymore. I just want to be free. I saw a cat the other day sitting down outside, no care in the world. I wanted to be them so badly in that moment. I didn't want to be human...

What do I do.... How do I get better?