how can i tell my mum that i want to be a girl i am a guy but i thin ki was born wrong body?

Answer 1

Perhaps you should be telling this to a psychologist instead of your mother?

Answer 2

If you feel comfortable talking to your mum about really important issues then i would ask her to go for a walk with you or find someplace quiet and remote where you won't be disturbed and proceed to convey these concerns of yours to her.