If you bought bitcoin last 2010 then yes your now a millionaire if you haven't bought wait for 2018 because bitcoin will largely fall next year and then jump high by 2019.
But for now since you bought that bitcoin on 2010, for me i don`t think that i can still hold my bitcoin until now, because by the time that bitcoin is really down you will surely sell what you have and also if it is really important or emergency situation.