dear Doowlehc,
doing what you love will always bring you success. it might be that you have to start making up lost time by practicing a lot, but you will enjoy classes. i'm faced with the same things, too, as i'm 43. i have enjoyed classes that keep my mind challenged. and, don't worry about acceptance or non-acceptance. if you accept yourself, have your own goals, and don't rely soley on this basis of acceptance -- you will have many opportunies come your way based on your playing ability. if you can play it - you're wanted (for your own recitals, opera/choir accomp.,take some organ lessons and play for weddings/funerals/church), take some conducting and you can do something with that, too. there is so MUCH to do in music and there is less and less competition the more you become proficient and know what YOU want to do (not relying on teachers acceptance). all you need when you graduate is some ideas of where you want to start reaching out. ask for referral letters. can't imagine (if you got good grades) any of your prof's not giving you that!