Every time you do what you told yourself you’d do, you get a little easier to believe.

Self-trust is built the same way trust in anyone else is built, by a record of statements matching actions. Each kept promise makes the next one more credible to you, which makes it more likely you will keep that one too. The reverse compounds as well, which is why people who break small promises eventually stop making them.

Make one commitment small enough that failing would be strange, then keep it for a week. The size does not matter. What matters is adding evidence to the file you are quietly keeping on yourself.