I wonder how people in other professions would respond to similar questions about their jobs. As a computer programmer, I often feel I'd be happier making violins and guitars than sitting in front of a computer writing web applications for various clients. I studied computer science so I could make a living as a game developer, but it turns out making games is both difficult and expensive, and the work environment at established game development shops is often quite oppressive. I wouldn't advise others to become game developers, but there's no denying that some do manage to turn it into a fun and rewarding career. I suspect it's the same with many other professions and professionals, and perhaps even most of them. Hindsight is not foresight, and you can never be sure you'd be happier today having chosen a different line of work way back when.
To the OP: I think you're right to continue with your studies, but you can still try your hand at making violins and see how you like it. You may think of it either as a hobby or as a second job, depending on how much time you have and how much effort you are willing to put in. It may turn out you like it enough to make a living out of it, but it's not a big loss if you find out that you don't.