I don't know who I am or used to be.

Here are some excellent resources on eHealthForum which may help you:

Diarrhea with abdominal pain and cramps
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broken pinky toe
Mole Cause for Concern?
Pain

Identity is something you'll struggle with for quite a while. You want to be liked, loved, looked up to and respected, as we all do. But which is the "real" you? Hard to say. The changes your going through now are stepping stones to the man you'll become. Here's the real important part- When you wake in the morning and look in the mirror you gotta like what you see there. You need to act in such a way as to make yourself happy, be proud of who you are and what you are becoming. You know why? That face in the mirror is going to stare back at you your whole life, friends come and go but those eyes looking back at you will never change. Maybe the changes you brought about are who you are now. Maybe you have a better understanding of the man you want to become. I myself think your on the right track, and if the girl can't deal with that, you need a new girl that can, or it will be a problem as long as you keep the girl. Being able to be yourself, being able to tweak yourself to make yourself the best person you can be is not a bad thing at all. And you won't please everyone which is why it's so important to please yourself, when it comes to yourself. Relax and just be, the rest will fall into place, and if the girl wanders off she wasn't meant to be. You want someone that will grow WITH you, not change you to their liking..
I wish you well..