Hi and welcome from someone still fairly new here.
First of all, martine, stop second-guessing yourself. Oh wait, I should have been saying that to myself! But then you'll find that true here. A lot of little details will be different, but overall, as you start to read various posts, it will blow you away to see posts expressing exactly what you feel. And it seems logical that within a group of people who feel they have something major to hide from others for so, so many years, there would be self-esteem issues. The day I finally verbalized to myself that I'm a woman was also the first day of my life when I said "I love me."
Scared? That's barely the word for it! But you might as well not be afraid of making a mistake. I've made plenty in just the few short months of accepting who I am. Hurting your family? This can't help but hurt them. They may come around and they may not. I'm living in an apartment for the first time in 40 years (and I'm DAMNED happy I'm not homeless!!) because my wife can't deal with this. I don't know if my son will ever speak to me again. Lose your job? There's a high likelihood. I can't imagine I'll get to keep mine. Some of us find ways of compromising and can deal with that. The suicide rate among TG's is horrible though, showing many of us can't find ways of coping in many, many ways.
I've come to a point where I see all the work I've done trying to please my family has hurt them already in many ways. Revealing that I'm TG is huge, but at my age, I'd say it's about time I take care of myself! That isn't being selfish. But now they feel the loss of a husband and a father. We know we're still the same person inside, but this is a huge adjustment for them and there has to be a period of mourning.
I've lived my entire life (67 years as of Wednesday) working hard to please others; keep them happy...and all at the expense of me. I faced the fear by simply knowing that I just couldn't keep this hidden for the rest of my life. That doesn't mean the fear went away and yes, it still has some impact on my decisions. Don't expect that to go away, but recognize when you're making a decision for yourself and when it's a decision for others. The latter does you no good at all and in the end won't protect anyone else anyway.
I've found it's a lot easy for friends to accept me than it is for my family. Male or female, I can still be a good friend in the same ways I've always been. If my wife or family see me as female, they wonder how I can be a husband or a father.
OK, now I'm rambling. Realize though that there is a lot of people here who need support themselves and so are very, very willing to support others. We can be much stronger when we rely on each other - and so try to wade through the excess verbiage (as in this post...) to find a nugget of information or wisdom from people that will help guide you.
Paula