This is basically just a rant, but does have an important question in there somewhere

I'm bisexual. No one knows, except for whoever reads this and one friend that I only know online (long story...lol). So my question is, what are some of the reasons that I should tell people? I guess I'm just not thinking of them. Obviously there's the reason of wanting to be open about it, which I do sometimes. But I definitely wouldn't tell my parents. My mom very often says things like "There's no such thing as bi. You'reeither straight or gay" and "That's just being perverted". My dad seems to believe the same thing. Funny thing is, my mom has said she wouldn't freak out if I was gay. But I'm not! A bit of a rant there, sorry

So I'm definitely not telling my parents. There's a few friends I would consider telling though. But I can't think of the reasons why I want to tell them. I know they would all be ok with it. One of my friends is gay (and her girlfriend/partner is bi) and the other people I would consider telling know her and seem completely ok with it. If I ever told them then there's the risk of my parents finding out somehow. I trust my friends, well as much as I trust people in general, but I'm still worried about it.

Well that's the end of my rant. So the question is, why should I tell people, if I even should at all