Pansexual, should I come out?

For those of you who don't know, Pansexual people are people attracted to people without considering their gender. Pansexuality is different from bisexuality. Bisexual people are attracted to both men and women, but pansexual people are attracted to any people. This includes people who are neither male nor female.
from here

So yes, I am pansexual. I've been confused for a while, and just recently discovered this. I'm certain this is not just a faze, and even though I may only be 14 (er, well, 14 on thanksgiving) I'm sure this is who I am.

I really want to come out to my family, but were not close, like at all. As I've said before, my mom is a complete stranger to me, and my step dad would b*tch about it. My grandma (mom's side) Is very homophobic, and even told me if I even slightly liked girls, she and my mother would disown me. My mom would probably kick me out. My dad would accept me, but my brother is kind of homophobic too.

Two of my best friends and my boyfriend knows, so I'm not worried about that.

Should I tell my family? I'm freaking I might get kicked out....

If I should, how should I tell them? Just sit them down, or....?