What you are describing is called gynocomastia.
It's breast tissue growth (not nipple growth) , from your hormones being out of balance too much.
Sounds like you are abusing , instead of using, the drugs.
Your testosterone levels are too high & your body is turning it into estrogen, to balance it out. The result is you growing breasts like a female.
It might be a good idea to go to a doctor and get some treatment for it, before it becomes permanent & requires surgery.
P.s. growing muscle doesn't grow your nipples & neither do steroids.