You're on to something.

I started with database programming, so mostly declarative. That was a joy and I did't need much time to catch up with the senior developers. Afterwards, I switched my employer and started anew with Java. I was completely overwhelmed and struggle to this day. Last week, I learned a little bit about streams and how functional programming works in Java. To my surprise, that seemed quite easy to understand.

I don't really know why OOP seems so much harder for me to do.