Actually saying that everyone is amoral would amount to admitting no internal moral life, so if you do believe that all people are sociopaths, you certainly shouldn't say it. On the other hand, saying that there are circumstances under which you could come to hold such a belief is a bit different. It shouldn't logically lead to a conclusion about what sort of person you are, but as the proposition that everyone is amoral is itself a morally repugnant one, I predict not many people will want to associate themselves with it even to the extent that you have.