Can I be poly (idk if I am) but still be committed to one person? I’m just in love with some people, each individually, but if things would get serious with one of them I could be in a monogamous relationship. Is that still polyamory?

I’m not the end-all, be-all determiner of who’s “truly” or “officially” polyamorous. That’s a journey everyone needs to take on their own - I can only offer advice and input. You don’t need my permission, or anyone else’s, to claim an identity. You may be polyflexible, poly/mono, or just a person who’s open to different relationship configurations.

Remember that polyamory isn’t a “stepping stone” to monogamy - it’s okay to date around until you find someone you feel “serious” enough about to be in a monogamous relationship, but that isn’t polyamory. But if you mean you could just see yourself in a mono relationship as easily as a poly one, especially if your partner wanted you to be mono, that’s very normal within poly circles. 

Don’t fret about what “counts” as what, and focus more on having relationships that are healthy and fulfilling for everyone involved.