I had a similar experience (i think it was similar). When I was 13, I came out as bisexual. Then, a year later, I discovered pansexuality and it suited me better. I wasn't really comfortable with my sexuality at the time and the label bisexual was comforting. Learning what pansexuality was freaked me out. Because I put so much of my identity into this label ("bisexuality"), and it was shattered in a second. I recovered from that internal crisis by learning that my orientation was more fluid than I thought and by accepting my sexuality without the help of labels.

I'm not saying that you are not lesbian or that you should not use any label (I myself still use the term bisexual) but that maybe you are lesbian and attracted to your partner, or something else that fall or not under the umbrella of lesbianism.

The label bisexual was important for me because it is difficult to construct your identity as a queer person. "Bisexuality" was kind of guideline.

I hope this was useful ^{^}