Whenever I feel sad, I stop being sad and be awesome instead. So they say on television.
Bluntly: If you’re so smart, then why are you conflating smartness with happiness.
IMO the two things happen in different hemispheres. You can’t reason yourself into happiness. You can compartmentalize-away unhappiness— for a time. And surprisingly unsophisticated things make you happy. It doesn’t make sense. And it doesn’t need to, because “making sense” is not any place along the axis of happy-unhappy.