Sore boobs

I 2 as wondering if someone could help me figure this out. The sides of my boobs have been really painful for a couple of weeks now I'm 17 and a 32 dd. Sone people have suggested it maybe my period but I have had my period for 7 years now and my boobs have never been a sign as to getting my period and this started weeks before I git my period. If anyone has any idea as to what maybe wrong with me please tell me. Thank you