I've had people tell me that I walk funny, or that I look clumsy or awkward when I walk (I look clumsy/awkward doing many, many things). I spent time as a child trying to learn to walk more normally, but I still look odd, I guess. Swinging my arms is not natural for me, so I have to remember to do it, and then I only swing one. I don't think anyone would know I was autistic from that, though.
I have noticed that I walk slouched over, staring at the ground. I think this is because the world is too bright and busy, and the ground is calmer. I can't look up when I walk because EVERYTHING is there and it's too much, so I stare at the ground, and that makes me slouch. Wearing sunglasses helps some, but I also just have to remember to keep my back straight when I walk. I'm sure I look odd. But no one has ever said I looked autistic.
BTW, I also look younger than I am.
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You don't need to hide, my friend, for I am just like you.