I am incredibly strong and determined.

Week one of anything is easy. Week three is where determination actually lives — the novelty gone, nobody asking how it's going, results not yet arrived.

Strength gets pictured as effort, teeth gritted. Mostly it looks like a person doing an unremarkable thing on a day they didn't feel like it, and then not mentioning it.

You've done this somewhere already. Find the evidence — a habit that survived a bad month, a promise you kept quietly when nobody would have noticed. That material transfers.