I have been lifting for 4 years and i have always wondered this.  Me and my brother (who is 13 months younger than me) always looked the same and were pretty close.  I lifted in high school (but not real seriously) and hes never really lifted till this day.  But i've suffered severe bouts with acne since i was about 15.  Im 21 and would still have major amounts of acne if i didnt take my medication.  Hes never had acne problems.  He's 6'2'' and im only 5'10/5'11.  My dad is 6'1''.  Im like the smallest guy in my entire family.  Also, since i was 19, i started to get a receding hairline.  Now, its pretty receded now (it looks like a McDonalds arch).  So i shave my head pretty close.  Hes 20 now, and shows signs of the receding but no where near where i am or was.  My question is, if i didnt lift, would all these not happen to me.  I am lifetime natural, no roids, no prohormones.  Only protein and creatine.  Would i be taller, not experience acne, and have more hair, or is this just a byproduct of genetics.