I hope everything goes splendidly well for you! Everyone deserves happiness and acceptance. What you're saying rings very true to me as well, I'm bi (or pan, I guess) and while my family is supportive, I know for a fact some of them would highly prefer if I ended up with a woman. It is what it is. But try not to worry too much! This is all about you and your boyfriend, it's a huge life event and a great cause for celebration. Your family should be able to see that and if they don't, that's very much their loss.