how to discuss personal problems with teacher?

[Ask Me ♥]

I ma having a very big problem and I want to talk to someone about it. Ever since about 7th grade I have had trouble with my self esteem, I think im fat when people tell me I am not. I stopped after 7th grade and now its coming back again, I count my calories and what and when I eat. I sometimes have thoughts of bulimia but I could never do it because I hate throwing up. I wanted to talk to one of my teachers who I feel very close with and might be able to help me because I really don't want to talk to my counsleor since i don't like her. This teacher i want to speak with is my health teacher and she brings up eating disorders a lot in class. I am in 9th grade. I wouldn't know how to bring this up so I need some advice on exactly how to say it, I would speak to her after school in her classroom with no one else. Another problem is that I think my period might have stopped, and this is an embarassing thing and I don't know how to bring up that either, thats a really big concern for me. Can anyone help me, thanks ?