Of course, it’s always possible that you’ve chosen the wrong career but somehow I doubt it. To become a successful musician requires a rare combination of passion and discipline. I don’t think a person can make that up. So that leaves you with you.
You say you have an intense fear of being vulnerable. Yet being vulnerable is what is required to do anything that matters. Falling in love , maintaining a true friendship, and launching a career all call for showing your whole self and risking being judged as not enough by others. My guess is that the unhappiness is a cover for your fear and your concern about career choice is a cover for your concern about yourself. The antidote is to love yourself, something you’ve apparently had trouble doing before.
It often takes a few chapters of therapy to finally make peace with ourselves. Building and maintaining self-esteem and confidence takes nurturing. I did a search of the mental health services in your community. (There are quite a few.) Please make some phone calls and see if one of the agencies has a sliding fee scale or a payment plan that you find manageable. You might also look into whether there is a women’s center connected to the women’s studies department at your local university. Often such centers offer self-help support groups. Since you are still a student, it’s possible that your student health services can at least give you a jumpstart.
You made an important first step by writing. Now take the next one and find the help you need. I’m already sure you’re worth the effort.
I wish you well.