I understand the pain of that completely. I've been told before by my friends that I'd be a good mom -_-
Since coming out as trans, however, one of those friends said she doesn't want to see me with kids 'cause I'd dress my little girl in army clothes and turn her into a boy. Oh my.
I've had the "children talk" with mom, and informed her that she will most likely not have any biological grandchildren from me, because I really don't have any desire to be pregnant.
In coming out to your friends and family....
Are you currently presenting as male? If you aren't, it may come as a bigger shock to them, really. If you are comfortable with it, i'd say maybe start presenting? It all comes with time, so take as many small steps as you can at a pace that feels good for you. I'm sorry I don't have better advice, but I never had much of a problem with this..I have been dressing how I wanted for as long as I can remember, since my mom didn't care too much she had a "tomboy" on her hands my whole life.
Keep posting here, its a great site, with lots wonderful members

Know you're not alone, we're all behind you