It does happen that the endocrine system malfunctions and orders up too much of a particular hormone, yes. But the thing is, if your body is in fact producing too much estrogen, then your hormone balance is by definition not typical of a cis male. Which is basically what you're saying by calling it a "hormone imbalance." (And neither was mine, as I was producing so little testosterone that I was closer to the cis female range than the cis male.) If that's true - and obviously you can't know until you get it tested - then your body is to some degree mimicking the results of taking estrogen, which in turn may mean that you got a head start on the effects of female puberty. I certainly did, in that I had some breast tissue growth long before I went on HRT.