I've been seeing a therapist, and recently got my letter of recommendation to start T, and my first appointment with my endo is in about two or three weeks. I'm happy about that because I'll finally be starting my transition, which I've waited so long for. One of my supervisors at work knows I'm trans, and she's fine with it. Everyone else at work is really laid-back and non-judgmental, and it seems like there's a very good chance that everyone will accept me when I come out as trans.
The problem is, I have a boyfriend now, who works for the same company. We've only been together for a week and already I'm freaking out about it, spending half the time kicking myself for not telling him from the start that I'm trans, and spending the other half of the time feeling relieved I haven't told him yet and wondering when the best time is to tell him. I'm so afraid that when he finds out, he'll hate me, or be disgusted by me (I'm 99% sure he's straight, he might be bi but I really doubt it), or think it's some sort of weird joke and not take me seriously. I've been trying to figure out what I'll say to him, how I'll bring it up, when I'll talk to him about it... but I really don't know what to do. The only thing I can think of to say is something along the lines of, "I'm the same person, just a different gender."
I'm just so afraid of losing him. I have to tell him before I come out at work, and I'm planning on coming out at work just a few weeks after I start taking T. I definitely didn't plan on having a significant other until after I transitioned (or, at least until after I had been on T for six months or so), and now that I'm in a relationship with him everything is just getting so much more complicated. Being trans is such a big part of my life, and I have to hide all of that from him until I figure out how to tell him I'm trans. I hate lying to him about it by not telling him, I feel so guilty about it.
I don't care if he still treats me like I'm a female after he finds out I'm trans, because it is a big change and I don't expect him to be able to accept it immediately. I do expect him to treat me like a man (assuming he even stays with me) eventually, but I don't expect it to happen overnight.
So the main questions are: How do I tell him? When do I tell him? What do I do if he freaks out when I tell him, because he (probably) doesn't identify as gay or bi-sexual?