No such thing. They called themselves National Socialists. Nazi was the propaganda term created for them. So you can not be an "actual nazi".
Its like the word americans are not allowed to say or write otherwise an oppressed minority would beat them up for it.
It only has power over you if you let it. After seeing what liberalism has lead to being called a "nazi" has lost much of its edge long ago.
In fact, by using it way too liberally it lost its meaning almost entirely by now.
What is your basis to say that you are? Because you were born there? This applies to cockroaches as well.
I am not saying you are not an american though.
You are not defined by what people call you, but by what you do and say.
By how you behave it is crystal clear that you are an american. Take that as an insult if you want to or whatever.