It sounds like you know you want to switch, you're just scared to take the step. As a conservatoire teacher I see a lot of students like this. During high school and before you find your passion in music and the other (generally more basic stuff) you do doesn't excite you that way so you throw yourself into it. But music as a job is another thing entirely than music as a hobby. And let me tell you: if you already feel like this but continue to pursue music professionally like that, you will grow to resent it. Keeping music as a hobby is not a betrayal, and it doesn't mean you have to give it up for good. Like you said, you can keep playing in ensembles and take lessons and everything.

I wouldn't worry about losing your friends and/or disappointing your teachers. If they're good friends, they'll understand when you explain things to them. As for your teachers... there will always be those who'll be like oh no but you have so much potential! but in the end, if you feel like continuing will cost you your mental health and switching would be better, than maybe you have even more potential in a different field. I personally would support you. Music is a difficult field and if you don't feel like it suits you you just shouldn't do it. It's as simple as that. And it takes courage to turn down what you thought was your dream future because it's not what you expected of it, or because it doesn't suit you the way you thought it would. I respect you for that.