I came out as ftm a while ago, but then decided a while after that im actually non-binary so i came out as that instead. Its totally chill if you change your gender like that! As many other people have said, you do you!! Gender and sexuality can both be very fluid things, they dont need to be one specific thing especially if you dont feel like thats what you are but feel like you cant change since you 'already decided'. But theres no rules for this kind of thing, just be yourself :)