I am a 5'5" college female who weighs 133 lbs and runs primarily the steeplechase, but also run 1500 and 5k. Everything and anything about getting faster talks about losing weight and ideal weights put me at 118-125, but I'm already at 18% body fat, and when I lose more, my hormones are thrown off and I don't get a period, but will just endlessly bleed and get iron deficiency (yes, male counterparts, bleeding does not automatically mean period). I have big boobs for a runner (DD) and I even got a mammogram to see if they are fatty or dense, and turns out they are denser than average (aka not going to get them much smaller).
Do I just give up on getting lighter? Doctors are not helpful. I run 40 ish mpw, but that's because I am slowly building back from the low iron.