If music is what you really want to do, do it. If it's your one and only passion, go all out. Even if it doesn't work out and you're working some crappy part time job, if you think that music is really what you want to do, just do it! Many people think success in music is being famous... but that's not true. There are so many different jobs and different pathways you can take. I'd suggest getting music theory in the bag though, it'll be really useful and make life a lot easier. Don't think you have to go down a conventional route in life and have everything planned out now. Take a chance if it's something you really love. Don't think about the what ifs, if your hearts in it then the skills you learn doing music and uni will stay with you for a lifetime. I really suggest going to open days for music production/business/performance (though they're online at the moment) and talk to the course leaders. They will tell you everything you need to know. Don't cross it out just because it's not considered 'safe'.