If it makes you feel any better, I'm not really "out" to everyone I know and while I struggle with that, there's a lack of functionality to part of it for my life. To those I date or share intimacy, I share it all the time, but not as much in casual circumstances with friends because even though I know progressive and smart people as @AncientNight said, we get crap from straight and gay people as if we 1. can't be monogamous, 2. haven't made up our minds, or 3. definitely gay, but afraid to commit to it. I say what everyone else says. Live your truth. Find your people and enjoy your life. Those who don't appreciate you for who you are will miss out.
That being said...it does do more for bi-visibility when we can be out and proud...but that's a personal choice to potentially tie your sexuality to politics. I know that's what some of it is for me.

I i.d. as gay, ...at this point in my life, because I figured out I want to be with a man more than a woman. (Took me years to sort that out.) But I was married to a woman and monogamous over 25 years. I absolutely know that bi orientation is not only real but also more common than many want to believe.
The thing is, sexual orientation, sexual behavior, and sexual identity are 3 separate things that happen to use common/shared terminology. If you identify as bi, you are bi, no matter anyone else's judgment about it. Some people might emphatically believe you are only "truly" bi if your attractions and behaviors fall absolutely 50/50 evenly split. By that nitpicky standard, virtually anyone afraid to i.d. as such could convince themselves they are basically gay or basically straight. None of that means that bisexuals are deluded or faking. All it does is point to how labels easily become prejudicially applied.

I came out as a lesbian in the early 80s, after a couple of years of dating men (they were the ones asking and I didn't know where gay people were). And then I went to college. Years of sex, dating,and eventually long term relationships followed, and all the while, I considered myself gay. I too, when confronted with people who called themselves bi, had the inner dialogue of "either the same sex attraction is a phase or the opposite sex attraction is just a fear of being gay... no one is really bi". Flash forward to now. I am a year out of a 20 year relationship with a woman (that produced a child), and I realist that my old inner voice was fill of shit. I was applying thoughts of my sexuality, my hang ups to others' lives. In college, I was angry, political, radical to the point of denying my attraction to men...I wanted a flag to wave, so what was true for me was true for everyone. So my point: you get to be what/whom ever you want, and the opposition of others' is just their lack of evolution, their immaturity, ignorance...which is really what prejudice is, right? The (really long winded...sorry!) way of saying you do you, and ignore the other BS!

Yes, you are. The facts don't change because people don't believe them. Bisexual is real. I wish I was. ❤

We exist, and it’s not just that we can’t make up our minds or want more than our share of love and affection.
I recognized my attraction to women when I was in college but married young and didn’t explore my bi side until my divorce 34 years later. Like you, I’m late to the coming out party. Most of my friends are chill about it; some seem to think it’s frivolous. I’m over caring what others think of my and my life. Best wishes to you with yours!

Me too

Worry about “you doing you” and ignor them

Be what feels right to you

I feel that because I'm married to a man that people assume I'm straight. Sigh.

Hello. Welcome to being misunderstood and accused of being gay but wanting to "hide" among the normals. I have learned that it is best to ignore folks that don't understand after an initial attempt to explain.

Lot's of people have what I call "my badge-ism", it's a strange paradox where they define their difference by denial of other people's difference, being bi is a wonderful thing just like being "straight" or "gay" are wonderful things if that is what you know you are and where you can be happy, people are people and how we treat each other is the most important, and most hard work to get right, it is a part of who you are and whilst being able to finally say it won't necessarily make life easier all around, having the faith in yourself to be who you are is a major thing so congratulations on having the guts to be you and never believe other people when they tell you that you don't exist just because it doesn't fit their version of what a person can be, their problems are just that, their problems, and your faith in who you are should never be undermined by that (easier said than done I know).

I'm also bi. Luckily, I haven't had the kind of problem you've had. After explaining it to people (if you even want to explain it), if they still don't accept or understand it, then know it's their problem, not yours. This article may help you. Good luck on your journey, and welcome to the fold.
[vox.com]

You exist despite their beliefs. It is a sad comedy when people are convinced their opinions make reality.

Good for you. Live life to the fullest.