If you're female and you're only attracted to other girls, then you might be lesbian. If you fancy other girls, feel excited when you think about them. It's not at all unusual to wonder about your sexuality - especially at a young age when you haven't Just for fun, I guess - I know I'm a lesbian. First off, you are not alone in questioning your sexual orientation. Know that many, many, many people are also and have also asked themselves. These are just two examples of how someone might know, and they're both valid. If you think you might be lesbian, try asking yourself these questions. When I.