It took me all of quitting, years of depression and accidentally restarting my career through a tech support gig to rediscover the massive joy I had solving problems with code.
I mean, I thought it would be a walk in the park and fun to boot. Computer Science - the computer part was cool. Science was cool too, so a Computer Science course would be amazing!
Except... it's not really about computers. And it's not about science either. It's a complete misnomer. Only after the sunken cost fallacy had taken full hold I realized that it was actually a math course.
If you took most of the Computer Science curriculum back in time, to a monastery hundreds of years ago, with no physical computers, it could still be taught in the exact same way! That's great, but not really what I thought I had signed up for.
Was it useful? Yes. Was it worth 4 years? No. And, for a while, I had a very dim view of myself, as I didn't excel like my peers did. This had negative and long lasting impacts. Took a long while to realize that it had nothing to do with my ability, just my lack of interest.