How do I carry the weight of decisions that affect other people?

You can plan your way through almost any uncertainty. The harder thing is that every plan has consequences, and you are the one who carries them. When people's outcomes ride on your choices, the skill stops feeling like a gift and starts feeling like a burden you cannot put down. That weight is the honest price of responsibility, and feeling it means you take it seriously. But notice the trap: you can control the quality of your thinking, not the outcome of every event. You are responsible for planning well and deciding with care. You are not the sole author of everything that follows. Do the work fully, then draw a line. When a plan is made as well as you could make it, tell yourself plainly: I gave this my best judgment. What happens next belongs partly to chance and to others. Carry the responsibility, not the impossible guilt of controlling the whole world. That distinction is what keeps a good planner from breaking.