I can't remember all the details, because I was still pretty lost and confused back then (I was about 14, I think?).. But the first person I told was my Mom.
At first I thought she was supportive, because she didn't treat me like I was delusional or disgusting like I was expecting her to. But after a few breakdowns and her pretending like nothing had happened after each time, I realized she didn't understand. For one, she bluntly told me "No, you won't" when I was bawling my eyes out about "never being able to be a guy", and two; she seemed to think I was merely a lesbian who didn't want to be a lesbian. (I never once expressed interest in a girl to her. Only men. She only thought this because she "heard that most people like that are attracted to women")
But I know it could have been much worse. Maybe one day I'll try again. (perhaps after I start transitioning)