How can I know if I'm bisexual if I had only one-gender experiences?

Having feelings or attraction towards both genders make you bisexual, even when you only have experience with one gender.

It's really different for everyone. Nobody can give you a specific answer. You'll figure it out eventually, but it won't be something you want to rush to find out.

You don't need to have had physical experience with both genders to know your bisexual. If you are attracted to the opposite gender in anyway or feel in your heart that you are bisexual, you most likely are.

It depends on if you enjoyed it or not. You may still have to have some more experiences to really know, but for now you can base if off of how that one time made you feel.

In the same way a homosexual teenager who has never had sex before knows that he is gay. You feel attraction even without having had sexual experiences.

You can know if you're bisexual or whichever sexual orientation you are by observing your attraction to others. Observe your sexual, emotional, and physical attraction to others.

if you are sexually and/or romantically attracted to both genders, you are bisexual irrespective of whether you have one gender experience

In the same way a teenager can know their sexuality before any sexual experience, you are what you are, you know what you want :)

Sexuality is fluid, and there isn't one way to find out your sexuality. Your sexuality is based on how you feel and what you ultimately decide for yourself. If you feel like you are bi sexual after one experience or even not having any experiences that's okay. Only you can determine that and no one else can tell you how to feel. You also don't have to label yourself if you don't want to. How you identify is completely up to you and no person can tell you how to feel about it. It's also okay to not know and want to explore.