You don’t have to know your sexuality/gender.
Is it a phase? Maybe. Who knows. Only time will tell. It can be fluid or just plain confusing. It’s different for everybody.
Some will just know.
Some will have been repressing it.
Some can’t tell.
All that is fine.
And if you use the wrong label? Thats okay. You’re still learning. Not everything is a clear perfect picture of a rainbow.
If people get mad at you for not understanding yourself yet thats their problem.
And if you turn out to be cis/straight? Good for you, you found your label. Use your privelege for good.
Tldr: Gender and sexuality is confusing so you dont need to know it yet. If you questioned and realized you’re striaght or cis, congradulations on finding your label.