You teach yourself your worth through what you repeatedly permit from yourself.

Your sense of your own worth is not built from what you say about yourself. It is built from evidence, and the strongest evidence is what you let happen without objecting. Each time you accept treatment you would not accept for someone you love, you file another data point, and your mind reads that file when deciding what you deserve. The lesson goes in quietly, without any dramatic moment to mark it.

Think of one thing you have been tolerating that you would never tell a friend to tolerate. You do not need to fix the whole pattern to change what it teaches. Declining it once, plainly and without a speech, puts a different kind of evidence on the record.