having a twin sucks,

Whatever sources say, about a different connection between twins, it's all a lie. At least, with me. My twin is something beyond reason. Today I tried to think of anything good she has brought me : guess what, the answer is nothing. When I had eating disorder problems I was very scared of telling anyone. Finally when I found the courage within me to tell her, after all the suffering, guess what she said : You're an idiot. Can't believe you are so stupid. Then she left.
Today, she decided she wanted to join the judo class that I have been planning on attending for a long time. I have my best friend Ej there and Jess might join us some thursdays for a laugh as she likes to say. This means so much to me. It doesn't make sense but it just does.
I had my last lesson of self defence today, and Steve as usually made my day by helping me fly. The feeling that comes from that is undescribable.
Well after all that joy, my twin had to come along and announce that she was going to join the judo lesson I have wanting for so long. This might seem selfish and harsh, but she is so difficult, and we ight so much. I wanted her to find another time to go. When I explained how much it meant to me, and asked her very nicely if she could go some other time, she said and i quote : I don't want to so fuck off. Then she laughed with her roomate.
What kinda person is this? And the worse thing is that it is such a complex relationship that most people don't understand it. And I respect that, but I need to break free, I need to be me. I am tired of the tears of desperation, of frustration, of fear of being compared, of self pity. I just want to be me.