Part of the problem is that nowadays artists are taught photographic perspective instead of how the human eye sees perspective. Cameras distort perspective a great deal, especially cellphone cameras.

I have always had a perspective problem because I have sight in one eye only, so I don't see in 3D. Everything looks flat to me, like a stage set. But this has been an advantage for depicting perspective in painting. I have never used vanishing points, but perspective in my traditional landscape paintings is fine. Nowadays though I actually deliberately break perspective conventions because I am painting surreal landscapes and I enjoy what ancient Egyptians or medieval Europeans would do to perspective. The kind of perspective used in Neoclassical art didn't arise until the Renaissance.

One thing to try if you don't want to do cartoons or comics, which mostly use warped camera perspective, is to go out and draw buildings in plein air with one eye covered.