For her, the key to minimize discomfort for riding and all of life has been keeping her core muscles strong.
X2 my wife is a pesonal trainer with a bad back. The key to living with is keep your core strong. Do at lease 15 minutes of back and ab work every day. If you couple that with deep tissue massage if will most likely change your life. Your young so if you start doing it now you will reep the rewards for years to come.