For most people, especially if your young, it becomes VERY obvious in the face and if genetics is on your side, elsewhere too, from 6-12 month region and hiding it won't work. For some, within 3 months, it becomes hard to pass as a man if you've got little beard. If your early 20's that's often the case.
Using anti-androgen could work to remain "stealth", since it de-masculinize and only slightly feminizes; but not sure that will be enough. The face shape won't change too much, but the complexion will clear and the skin will get smaller pores. If you suppress testosterone enough (which is required for a anti-T treatment to make sense) and don't take estrogen, your energy level will be low and you may have cognitive problems. Long term, you get osteoporosis problems. Of course, there is the also possible problem of permanent sterility after more than 6 months (but in all probable case, its more of a decrease in fertility that occurs, if fertility is low enough, you're in fact incapable of having children through normal courses, though test tube procreation may work).
My feeling is that if your not ready to face the risk of losing your friends (which may not be the case), you're not ready for this. You should really think this through. I don't think you have!
