How do I get “boulder” shoulders?

I'm curious but are certain bodies doomed to not get big in some areas? I've been grinding away doing all the shoulder workouts but don't see any noticeable size increase. In fact, this has been the case a bulk of my life. I’m almost convinced some body types just might not get gains in certain areas where it's easy for others. I would appreciate any thoughts on this. (And exercises that helped get higher, noticeable shoulders) Thanks.