You're almost describing me.
When I was young I didn't pay attention to social rules and didn't have many friends. It wasn't until about the age of 15 that I got a best friend who was a lot more social than me. I watched the way he interacted and tried to copy some of his actions and phrases, which sometimes led to disappointments. I always thought I was just socially slow and, watching older friends and cousins, that I would grow out of it eventually (which I didn't).
The reason why my parents never suspected something was different about me is that I'm generally smart and always did well in school. Looking back at my school years I remember all the sh*t I had to go through just because I was under the illusion that I was "normal", and some of the "friends" I had were only using me for their own entertainment, even to the point of insulting me to my face, without me realizing.
I've also wished that I wasn't intelligent, because it only raises people's expectations of me, and makes them frustrated when I fail. But then I remember that it doesn't have to be a bad thing, and I can use it to my advantage in life.
So, no, I can't really fake NT. People can always tell there's something "off" about me, but often can't put their finger on it.
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"They sound good in my brain, then my tongue makes not the words sound very good, formally." - Homer Simpson
Undisgnosed - Aspie score: 122 of 200 - NT score: 105 of 200