Your dad is doing the best he knows how. Acknowledge that, say thanks, and move on.
Accept your body for what it is and work with it. Your physical health is tied to flexibility and there’s only one way to get more flexible.
The choice is always yours.
Anxiety will be a major player in your life forever. Lean in to it.
When it’s brutal, get out of the way.
P.S. Say nice things to yourself sometimes.