Can I be bisexual with out ever being with the same gender?

It's a serious question, I know for sure I like guys and I like girls as well just never have acted on it. I've never been with a female but a lot of people say you can't be "something" without having experience, if you will. And those people don't happen to know I like females but my SO thinks I do and is ok with it. I'm honestly lost with what I am

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