After breastfeeding

Alright I am a FTM. I now have a thirteen month old baby boy. And have breastfed since he was born. We are definitely coming to an end as he only nurses two times a day. Even sometimes once. So quick recap I have had a tough time latching left breast due to inverted nipple and just gave up on it. However right side no problems and have nursed him with that breast. Now my main issue is doing this my left breast is noticeably smaller than my right breast. Question one) has anyone else had this issue of different sized breasts due to breastfeeding? And 2) when I’m done completely will they go back to normal same size ? TIA literally puts me down every single day