I know what others like, but I don't know what I like.
It's something I've always noticed since I was a little kid: I'm able to know what others like and how they think, sometimes even better than they do themselves. But when it comes to me, it's a total black hole: I don't know what I like, so I have to analyze things just to figure it out.
I think it's due to my nonexistent Fi (INFJ 5w6), meaning my ability to understand others' desires is linked to my Fe.
Is this the case for you too?