Bicuriosity is common in the majority of women as far as I know. Even if you were completely sexually attracted to women, which nothing you've said indicates that you are, then that would only make you bisexual, not a lesbian. There is a significant difference, lesbians are not sexually attracted to/sexually aroused by men. Furthermore, many women who consider themselves completely straight have had flings/sexual encounters with women at some point in their lives. What you're describing sounds more like unfounded anxiety i.e. worrying about something that's no big deal at all, so just try to relax.