Well let’s start with that question mark being totally unnecessary, because I can’t see what the question is. I presume you meant something like:
I’m sure that inside is right (wouldn’t the question mark look wrong outside?)
However what about this one, where the question is outside the parentheses:
Is inside right (I think it’s wrong to put a question mark outside)?
Fundamentally, almost all the time it’s correct to put the full stop outside, as otherwise you haven’t terminated the sentence outside properly (inside would only be required if you were terminating the inside sentence and not the outside one, which would be odd).