What happens to the adult women who never marry, don’t have kids and don’t have a career?

I’m nearing 37, have never been married, no kids. Even though I’ve tried making a career for myself several times, I failed. Went to college but didn’t have the smarts to pass my math classes (was ok in everything else) so did not get a degree. I tried career paths that didn’t require a degree, such as getting licensed for a few things but didn’t succeed. I’m working basically freelance for things I can get. As I’m getting older, I’m getting worried about what the future will look like. Anyone out there older that is or has been in my shoes? Any advice or your story is appreciated