I never thought of the concept of "a lesbian" like that. Back then, a man couldn't be anything other than a man and live up to the masculinity that manhood requires...so gay men were known as "a homosexual". The "a homosexual" was "the other" label for a gay man. Now, the term "homosexual" is becoming outdated.
Times do change. There are new labels created every day to help identify those under a blanket of identities and pronouns. I myself am lost as to what I called myself. In high school, I was questioning; now I'm clueless. But part of creating who I am is to explore the identities and frequencies. If you do not want to be called "a lesbian", make it known to your loved ones. Do whatever makes you feel comfortable to be who you are.