Sarahmaybe, everyone above has said things far better than can I, but I just want to add my support....
I spent way too many years trying to tackle all of this ALONE. So, my heart goes out to you. Coming from a family where we didn't confide in each other & didn't really know each other's souls, I did not learn how to trust others, how to open up. The suggestions above re: therapy are especially wise -- but, I hasten to add, try to find someone who specializes in TG matters, it will make a HUGE difference. I've been in and out of therapy my entire adult life (I'm 64, my SRS was at age 37), and though I've had some wonderful counselors, almost none of them -- even with the best intentions -- knew a damned thing about TG stuff.
I know, you said that therapy is simply not an option. I confess that it's hard for me to understand that, unless money is a factor and you need employer-provided insurance to cover it. If that's not the problem, you could surely see someone privately without your colleagues at work knowing. Or, possibly you're in a rural area where everyone knows everything? That would be rough....
Any close friends whom you trust? Any empathetic women friends to open up to?
I know, it's all far easier said than done. Remember, I myself was in the exact same place as you: absent having any accepting souls to share my real self with -- or, at least, my thoughts about FINDING my real self -- I ended up abandoning a successful career, abandoning everyone I knew, and escaping to another city to make the search alone. It would be so much better if you can find SOMEONE to share your inner cravings with.... All the best in your journey.