Ruined their lives? Well, it's only so because of the social expectations and how most of society looks down on transgender/transexual people, among other things. Hmm, it's good that ya'llve got each others backs and stuff.
Actually, it's really good that you've more or less discovered how you feel about yourself at such a young age. Since you said they make do you masculine stuff, I'm going to assume you haven't told your parents or they ignore it. Either way, if they ignorant of it, they should at least be aware that if you're old enough to identify yourself, then you are also old enough to attempt suicide.
Oh, I'm very aware that transgenders hide who they are. However, don't feel like you're just another brick in the wall. You can do something and you can move on in your life. I'm going to PM you something as I know someone who can probably assist you in some way. I'm hopeful she can do something for you.
I'll be here, as well.