If it were no longer part of their lives, perhaps they would think differently.

[But that's not going to happen.]

... Have you considered scholarships, if you're not already in one? I was able to get one for my art course, which covers a fair bit of major costs. It's... difficult to get, but you have the drive and skills to prove you would be worthy of the support. Do you have certificates for musical grading, or pieces you have worked on independently?