"you could stand up to these people and explain the scientific proof of the existence of genderfluidity and explain that you are indeed who you are and that they can shove their discouragement" I have been looking for this kind of thing all over the place but I cant seem to find anything... its one of their main reasons for thinking my gender is just some bs im pulling in order to "be cool"... do you have any links i could use?

All of these sources are backed up by studies of gender and/or experts on the subject
 http://www.genderdiversity.org/resources/terminology/#genderfluidity
(This one is mainly about the lives of genderqueer people but it goes into a bit of detail on genderfluidity) http://www.huffingtonpost.com/youth-radio-youth-media-international/gender-fluid-generation-evolving-gender-norms_b_6813064.html
http://thornysterling.com/2014/08/21/understanding-genderfluid-an-interview-with-theo-fenraven/