The people who doubted you won’t be at the finish line. They moved on to doubting someone else weeks ago.

Doubters are far less invested in you than the story suggests. Their comment came out of their own week and was forgotten by the afternoon, while you have carried it for months as a thing to disprove. Building a life around proving someone wrong hands them a permanent place in it that they never asked for.

Check whose voice is actually driving what you are doing. If it is theirs, find the version of the goal you would still want had they never spoken. Motivation built on a grudge runs out at exactly the moment you need it most.