Grind,
I reread your first post and I think you misinterpreted what your family said to you. Despite what you thought you heard, your family is not saying they don't believe in YOU . It's the art/music world that they don't trust.
If they tried to discourage you from a field that is a meritocracy, that would be saying/implying that they don't believe in YOU....your ability to compete and succeed.
In the arts, your intelligence,skills, creativity,drive don't translate into success as easily as in other fields. That's what the "you'll never make it" comments or implication is about.