First Hint
The first hint I got was the simple ability to simply know what I needed to do. Granted when I first got my powers I had no idea how to use them. I would float up randomly, turn invisible, go intangible, and was more jumpy than I should have been. I had been forced into a new world of sensations that were so much more powerful than what I was used to and I didn't know how to use any of them. I didn't even know what any of it meant. Eventually, over time, I gained an understanding for somethings on my own but the others just came to me. I had to work to control the ability to fly, to stay visible, and solid.
At first, before I figured out what was really happening to me I gave myself credit or assumed it was just a common sense thing. It must be common sense to simply know how to use your powers even if you weren't fully a ghost. It must have been easy to figure out when I gained a new power. I figured my ghost sense was just trial and error luck. A wisp of breath and oh look a ghost. Another wisp of breath and ooh another ghost maybe this is a ghost sense because it only happens when a ghost is near. I just couldn't figure out where I had learned to fight from. I have always been the loser who was beaten up and I have never stood up for myself really because what was the point? I would just lose the fight, get beaten even worse, and then still get detention. Best to just take the hit and go to class. So it was weird that I suddenly knew how to throw a punch (something I had never done before) and not break my wrist, when something was at the right angle for a certain maneuver to work, or just the fact that I knew how to move point blank. I wasn't some awkward clumsy kid in an outfit trying and failing to fight ghosts. I was a kid who was actually fighting ghosts and kicking butt.
So when I started moving without really paying attention to it or dodging things faster than I could even think about it I attributed it to experience. Same thing with the sudden cockiness I felt whenever I was in Phantom form. In this form I am the hero not the loser. In this form I can fight and stand up for myself and still win. I have every reason to be cocky and happy with my self. I don't have to be awkward or slouch over. I should have realized sooner that a personality should not change fast like that. Especially not between forms. I could go between cocky Phantom and awkward Fenton with almost whiplash worthy speeds and I didn't think anything of it. Maybe that's why Jazz always thought I had some sort of alternate personality disorder or something. I never even really noticed the change until it was pointed out and even then I still didn't think it was unusual.
After some time I began to sense when something was wrong with my body. I don't mean just the regular sense either. A normal person can feel a broken bone by the sensation of pain. I can feel it by the actual break. Yes I can still feel the pain (however muted it may be), as well as how broken the bone is. It was around this time that I first met the voice in the back of my head. It was this not quite there voice that always warned me when something was fundamentally wrong and how to do almost anything new that involved my powers. How to channel the energy to make a blast, how to aim, how to fly, and so many other basic things. Even at this point it wasn't really a separate voice from my own. I actually thought that maybe it was my subconscious telling me these things for a while. I am glad I was wrong. Things are less lonely now.