I don't think you CAN make yourself care about something. I'm struggling somewhat wth the same. What I care about and love is not seen as valuable in my family - the arts. So, therefore, I think I have to care about having some job at a lawyer's office or in a scientific field or something, and I really care about music, dance, performing arts. I feel like what I care about has no merit, but try as I might, I don't care that much about those desk jobs, or jobs that have higher earning potential, so I feel like a loser.

I don't know how you can force yourself to care about anything.
I think you would be pretending and living in secret agony if you tried to care about something you have no interest in.