Is this normal?

I'm a 15 year old female and I identify as bisexual but lately I've been feeling a lot more gay. Like it had been a month since I'd seen a guy and felt attracted to him. I was beginning to think that I am gay not bi. That was until a couple days ago when I saw a picture of young Leonardo DiCaprio and now I'm back to being attracted to both males and females. But for a month I was only feeling attracted to girls. I would wake up everyday and either feel gay or ace. There have been days in the past where I felt straight. Now most days I definitely felt bisexual. Is it normal to kind of swing in between sexualities? I know someone's probably going to tell me I don't have to put a label on my sexuality but I want to. I personally just feel like I know who I am better if I have a word for it.