For me, once i realized i was a lesbian, i was able to look back and see that it was always women i was fascinated by, it was attractive women that caught my eye in public or in movies or when considering celebrities. i could care less about all the popular male celebrities and when i'm out in public, it's always the attractive women who draw my gaze. Reflecting on my teenage years, when every female i knew was all about Patrick Swayze in Dirty Dancing, i was enthralled by the scene where Jennifer Gray and Cynthia Roades were dancing in high heels and pantyhose together and the camera panned up their legs. In Top Gun, i didn't know a single female who wasn't obsessed with the volleyball scene but it was Kelly McGillis in that see-through white shirt leaning against the wall or in her uniform all no-nonsense and confidence walking up in front of the class of hotshot military asshats that i couldn't get out of my head. It was always the girls that caught my attention.
i don't think you need to decide what to label yourself right away. It's ok to be fluid or undefined, whether that's for now or forever. Just do what makes you happy and feels good. Indulge in some solo masturbatory fantasies and see where your mind takes you. If you have the opportunity, maybe try kissing a girl while you're sober and see how you feel about it. You can try on some labels (like, literally stand in front of a mirror when you're alone and say "I'm a lesbian", "I'm straight", "I'm bi", "I'm pansexual", etc.) and see which feels the most comfortable. But really, try not to get too hung up on the labels. Explore what draws your attention, what you like to look at, what you like touching, which fantasies do it for you. Maybe even read some lesbian or bisexual fiction or watch some movies (i don't mean porn, though there's nothing wrong with that either). When i was pretty sure i was a lesbian, a friend of mine who is a lesbian also suggested a couple of lesbian movies and said that if i identified strongly with the lesbian characters and was turned on by the sex scenes, then i at least probably wasn't straight. Also consider that sexual attraction and romantic attraction can be different. In reality, i think the majority of women have at least a degree of bisexual attraction but many are not biromantic, meaning they can be attracted to women and men but aren't romantically interested in other women, which, honestly, is the fear a lot of lesbians have about dating bisexual women. i don't think it's wrong to be that way, but it's important to explore it and understand your feelings on it because you should be honest about expectations and prospects with partners so you don't hurt anyone unnecessarily.