Shift your goal to something more realistic based on your new knowledge of the world. This will happen multiple times throughout life; it’s part of the process.
Jordan Peterson covers this extensively in his course Maps of Meaning. You can watch or listen to the course on youtube by searching maps of meaning 2017 full course
I know he’s controversial, but mostly based on lies people tell about him. Sometimes to be happy you gotta see past the bullshit and go check something out for yourself.