A secret identity. You need one, and it has to be good. Your enemies can never know who you really are.
But the more you think about it, the more you realize that any disguise, no matter how elaborate, has its flaws. After all, you aren't technically a real person. What if someone pierces together that you're just a guy who managed to turn himself into a woman made of rubber?
Consumed in your thoughts, you don't even notice that your footsteps have taken you out into the hall. There, you see some old things mounted on the wall. Vacation pictures, small cameos, paintings made by some artist friend of your mother's...
And a photo of your mother taken when she entered preschool.
You take a closer look. Oddly enough, you kinda look like your mother in your adult female body. Perhaps...
And then you have an odd feeling. It's like your body is starting to bubble and foam. Everything around you gets taller and taller. Then it hits you. You're shrinking.
Before you can react, your body is suddenly three feet shorter. Your boobs are gone, and your fingers and toes are tiny. You barely reach the top of the kitchen table. You're must be what, 7 or 8?
And yet your adult brain is still fully intact. You quickly grab the material of your now-too big spandex suit and bunch up and fold it until it's short enough to make a dress that covers your knees. You even have enough left over to make some cute little shoes for your baby feet.
Well, somehow you've made yourself a new identity. Now you just need to find yourself a school that's accepting new transfer students. And a ride to get there.