I'm 15 and have noticed yellow hardish discharge coming from my right breast and want to no if its normall?

Are you male or female? You have not included ANY information that can assist me to assist you.

I think you may have some colostrum, which is the fatty constituent in breast milk-If you are just growing breasts this is a excess of oxytocin (breast milk hormone that lactating mothers have).

If you are getting a pus-type discharge then it may even be a blocked or infected milk duct-are you in bad pain? Do you have a lump under your arm or in the upper quadrant of the breast? These symptoms could mean infection-antibiotics may help.

The feeling I get is that this may be a slightly abnormal result of extra hormones in your system-I don';'t know where you are in your stage in puberty. But I'd say that you are okay (unless there is pain).

Hope this helps you
Cheers