Nipple discharge and pain

I have like clearish discharge from my right nipple only. And it’s only the breast that I have like sharp pain in. And part of my nipple is turning white and it is painful. I’m not sure if it’s normal or not. I’m 18 and this has never happened before. I had sore breasts before and then had a miscarriage but that has been over a month. The sore breasts went away and this started about a week ago but the discharge has been happening for almost 2 years