One, stop worrying about the specifics of your sexuality. Just focus on getting to know PEOPLE and allow yourself to be attracted to whoever you want.
Two, have you had sex with a girl or have you just thought about it? Because unless you actually try it, you really don’t know for sure. Especially if you find yourself attracted to women and it’s the sex aspect that concerns you.
Three, strap ons are a common presence in a lesbian sexual relationship (especially long term relationships). Both women get pleasure, it’s just in different ways. Again, you really won’t understand it until you try it. What’s the harm? Experimentation is the best thing you can do for yourself.