>This is probably a good example of the fallacy that says that if I can do it anyone can.

It is unfair to accuse twosleepy of a fallacy, because it rather depends on what twosleepy was trying to prove. Any unconditional postulation, such as, "It is impossible for an adult to A" is falsified by a single exception. twosleepy does not claim that, "It is easy because I did it"; but simply, "It can be done because I did it." I don't see any fallacy here. (I can't comment on the "Golden Rule Fallacy" however, because you waggishly choose not to define it).

twosleepy, tell us: What language did you master and when did you start learning it?