have to go pick up my son in a minute.”
That’s a great example of an old negative thought.
Have to means “possess as a duty”.
And that’s exactly how it feels if you think about it that way. Uh oh, here comes a duty.
But I don’t pick him up from school out of duty! I pick him up because he’s a delightful kid and I’m eager to see him, and I get to be the first person he sees after school, enjoy his smile, ask him about his day and bring him back home.
Do you want life to be full of duties? It’s just a form of expression, but words carry meaning from context and other uses, and when there are much happier words to use why not use them?
“It’s time to go pick up my son, and in case you’re wondering, I love doing it!”