No one has everything Figured out. Everyone is as scared and clueless as you. People act like they have got their shit together but they haven't. They are suffering equally. I can't paint a happy picture of the world everytime cause there's this thing called reality that Exists and we have to go through it. Life is not easy and we have to sometimes "choose" among lots of different things.
How do you know what's the right thing? You Don't!
It's a trial and error. You just choose something and give it your all until you succeed in that. Of course you don't magically succeed in anything. You have to go all out on it. You have to take risks. You have to ask for help and guidance with people. All I am trying to say is that you have to Give it your 100% so you don't leave any room for regrets in life.
So stop making life so super complicated. Don't overcomplicate things for yourself by overthinking.