sore nipples after almost 3 months of breast feeding

Sarah • mommy to 3 handsome boys 👬🏾👶🏾 & a beautiful baby girl

so I been breastfeeding my son for almost 3 months lately even when I'm not pumping or he's feeding off me. My nipples are so so sore. Has any other mom had this happen to them or tell me what I should do?!