Good Morning Findingme, and thanks for posting your comment.
Coming out of a 12 year relationship isn't easy, but what it has done has taught you something about yourself, so I'm sorry it has ended, but more pleased that it has taught you exactly how you are and that's a positive.
The people you are most scared of telling aren't those who you should discuss this at first with because if you do it will only push you further into the closest.
Tell one person, get their support which will bring more confidence in telling those that need to be told and maybe your doctor could be the first person, although this may have already happened.
You could tell your parents by bringing home a girl and say you're going to watch a movie and for a male that you're going to a party or vice-versa that way they will get used to seeing both sexes.
You can't disguise something that is real and never be afraid and once people know, it’ll be one of the best things that’s happened to you.
Talk to other people who maybe bi-sexual and bring them home with you and make sure you have a safe network behind you which you can go to, if anything goes against your wishes.
Remember you may not have to tell anybody, you can live with someone the same sex, that happens frequently, also go out together, I don't see a problem, 'you are what you are' and people have to learn to accept it.
Let us know how you feel.