Hi nico_nico, very nice to meet you. please call me dee, but i am trav's mom. trav is my 18 yo son, who first came out to me as gay about 3 years ago. that was hard for me to accept, but not unexpected, as i guess i had always known, and feared, that he was gay. ha ha, as i look back at pictures, i can now laugh and say, and who would have guessed! ha! but, just within the last two months, trav has come out to me as transgender male to female. so, now i have something else, even harder, to accept! but, accept i will because i love my son, soon to be daughter. and your mother, i believe, will accept your decision as well.
i think i might be able to help you understand her position, though, and perhaps that will help the two of you to talk about it in a better light. since you're here, and since I'm here, this is my take: she HOPES you are mistaken, because she doesn't want you to suffer. she knows the hardships that will come with this, and she can't protect you from the world. THAT is her biggest problem with you being trans.
i suggest you direct HER to this site as well. perhaps, she, as I, can understand you better by reading and learning, educating and informing herself. that's why i'm here. most of all, for both your sakes, talk to your mom. tell her how you FEEL, how you have FELT for a long time, and lead her here. and, if you can, try to understand her just as you ask her to understand you. it's a process. it takes time. hope this helps.
good luck and peace and happiness be with you and follow you and your mother through the journey,
dee