honestly, does it really matter? date whoever you want. you can date a girl. you can date a boy. you can date anyone. and nobody is going to judge you or say "oh but you're not a lesbian, so you cannot date other girls because it's wrong", it is NOT wrong.
i think you should find a girlfriend and see if you're actually attracted to her. do different things together. does she make you happy? do you find her attractive? do you like having sex with her? if yes, then you're probably (?) insterested in girls, and you can define yourself as a lesbian. but, we don't really need "tags", just do whatever you want. it's not a big deal. definitely not the end of the world.