where do i fit in in life?

I don't know what to do, I hate structure, and I have an issue with doing one thing for the rest of my life. Like are you kidding me? You don't even know what is gonna happen in the future, you could life for like 10000 years or you could die and be reincarnated as a damn plant, like you might not even remember what you did who the hell knows, but still you decide to do ONE thing? I can't get around that. I don't really want to do one thing for the rest of my life but that's how society is set up. Where do i fit in?