rape/missed period

ok so a very bad situation happened to me and now my period never came and i don’t know what to do. i can’t go to anyone about this because i don’t want my life to change but i see him every day, he is my neighbor and i’m 15 and he is 43. what do i do? Edit: okay so he is my kinda uncle so it’s his word against mine(my family’s long time childhood friend). my parents would say i’m lying because i want attention or something like usual, he is also my best friends dad... this happened to me on june 8th.