Yes, there is really just one person you're made for, and do not ask if this is the person or not when you meet her.
If you ask, it means:
(*) it is not yet time for you to know
(*) or, she is not this person
Unfortunately, it happens that some guys look for his one person during whole life, and she never comes ever. It is because they were very focused on the question and signs.
Sometimes destiny requires you to make very weird and initially not explainable by logic, steps. It's because your person could be even in another state or even country, and you have free will to decide if you able to reach her, because you did not know whether it is about her at all. It could be initially a part of something totally different, business trip, for example, or something else.
Or it could be "invisible" girl under your nose, you never paid attention before, too, by the way, till something unpredictable/unexpectable, or even, regular, but non-detectable before, happened. Or she could be your current girlfriend, too (but not in her current state and your current state of mind, for sure).
Nobody could help you! Do not believe the tapestry of advices. There is no universal expertise. Still, universal truth exists, but nobody among humans could tell for sure.
Don't believe me either.
I believe in what I said, because I found my one person, and it was not easy or in the way I expected it gonna be.
Good luck!