@deadgirl - the employment “data” for music degrees is no secret to most students … in a general sense.
Having a survival job is VERY common for performers when they leave school (however staying in such a job for years is not common). Also you don’t know what else these baristas are doing with their time. They may be doing a low key job to stay available for performances and auditions…again fairly common. Also it is not uncommon, in any field, to change your focus from one area to another (i.e., performance to arts management). So…yea that’s all true. It’s either a match for your personality or not.
I would suggest some career counseling. Maybe when you get to your university and do your first class schedule, you could speak openly with your advisor about a career path that matches your interests and personality. Be sure to express your concerns about music…the advisor will know how difficult a music career can be. Then he/she and you can develop a plan to move forward in your studies with more confidence.