A risk you can undo is cheaper than it feels. Try things you can walk back.

Decisions mostly feel permanent while you are making them and turn out to be reversible: a class you can drop, a job you can leave, a haircut, a sport you can stop. The sense of permanence is what leaves them sitting undecided for months. Sorting your choices by whether you could walk them back shows which ones deserve all that deliberation, and it is usually fewer than you expected.

Ask of the next decision whether you could undo it within a term. If yes, choose quickly and begin. Save the long thinking for the few you genuinely cannot take back.