I don't know my career plan, help?

I’m 15, and I’m currently freaking out about what I’m going to do with my future. I know I’m young, but the professions I want to pursue are things that I’d need to decide on pretty much now. For example, I’ve been playing violin for about six years, and I genuinely love it, but since I didn’t start earlier and can’t do private lessons (me and my family are poor and nobody will hire me), and I have the cheapest violin out there. Currently, it’s my passion, and I can’t go one day without picking it up, I just don’t feasibly think I can pursue it as a career. There’s also my art, but when drawing I feel amateur, no matter what I do and how much I practice my painting and drawing. Art school may seem great right now but I know my art is probably not going to financially support me forever. I’m terrified of living a domestic life, so much so that the thought revolts and disgusts me. I’ve been told I’d make a good teacher, but again, domesticity. It seems that no matter how much effort I put into everything, I get so little result, and it’s driving me to a point of no return. I keep thinking of myself as a failure, every time I pick up my instrument and every time I pick up a paintbrush or pencil. I just need an opinion from someone who isn’t close friends or family, so what do you all think? (non of that “you’re only 15, don’t worry about it” either, I’m truly sick of hearing it)