I'm at my cousins right now and there little boy (2 years old) kept calling me a boy and my 1st cousin said "She's a girl" over and over again and it's really making me feel like ->-bleeped-<-. I have not told my family to call me "he" but they know what I am and they're making me feel suicidal. What should I do about this?

Sorry to hear that. Look on the bright side, though: at least the two-year-old knows you're a boy.

Is your first cousin an understanding person? Maybe you could pull him/her aside and say it really bothers you when he/she refers to you as a girl and ask him/her not to do it again.

She doesn't seem to be understanding, my 2nd cousin (her son who is my age) knows I'm transexual but he refers to me as female too.

Well, I dunno. Maybe you should at least try to confront them and ask them to stop referring to you as a girl. Doing nothing about it won't make them stop. And if they keep doing it, you'll probably just get really angry or sad, probably both. I don't really know; it sucks that they're not understanding about it. 

some people know that transsexual exits but when confronted with it, dont really know what it entails. your cousin could just be like that, she could just not fully realize the extent to which you identify. i think a one-on-one explanation would help. it's worth a try

Well, if you haven't asked or pushed for being called "he" then you'll probably keep hearing "she".

I'd suggest, as I always suggest, to calmly and consistently correct people with a "he", "him", "boy" etc, when people get it wrong.
No emotion, no arguing, just a calm interjection of the correct term.

It'll sink in fastest that way.

Well if you haven't directly told people that you prefer male pronouns then you can't expect them to just do it. And I'm not sure if you've told your family that you are trans but if you haven't then people really won't "just know what you are" you will be surprised at how stupid people can be. And if you have then you need to talk about it more than once. Its a process for everyone around you, not just you and they need guidance just as much as you do.

I'm afraid some of my family will say "You're NOT a boy though, you may have a male mind but you are not a boy" and that would really hurt me. I get depressed when someone says that.

See Kentrie, that is where they are wrong though and you just have to remember you are right. You are a boy and although I don't understand why some people won't just understand that, sometimes they just don't. You just have to think, is it easier to talk to them, deal with hearing them say that a few times, and maybe start calling you the right gender? Or is it easier to ignore them calling you female and not talk to them about it?

Carson is right... sometimes it isn't enough to just come out. My grandma got into a fight with my ex after I had come out to her because my grandma was POSITIVE that even though I had come out to her as trans I still wanted to be called Amanda (ugh). Sometimes they just might not know unless you tell them.

My 2 year old cousin still insists that I'm a boy. My first cousin will say "No, Kentrie's a girl" and he'll say "Him a boy!" so at least my 2 year old cousin calls me "He." They don't even "Correct" him anymore. So that's good for now.