If you’re thinking, you’re the only one clueless about what you are doing and what you will do in future, you’re wrong.
Almost everyone is figuring it out. Even the ones whose lives look most sorted from outside. Each one is just winging it and expecting it to work. Noone really knows what will work and what won’t.
The point is, you need to try things out. You can’t just sit and try to figure it out in your head first and then get to implementing it. Get your hands dirty. Experiment. Do things you’re unsure about.
Not all of them will click, but some will. Those will be enough to get you started.