I need some advise...

Being left out sucks, especially if it's a school activity which a big audience has to watch.
Try being mais social and if anyone ignores while your talking then say "I won't be ignored, you listen to me pal, I'm the one talking here".
You should try being mais demanding is what it is.

Stand up and kick their Ass! If your not going to be accepted naturally, then be accepted forcibly! Be the person that stands up! They start conversations, but you finish them! If they don't like you, then too dam bad! You're there to perform your role in that play, and they are going to like it! Show them who YOU are!

keep incerting your self until they notice you thats what i do annoy the shit out of them

I'm not good with advice, so urso with me.
But, to be honset, if I was you, I would keep to myself a little bit. I'm naturally shy, but this year, especially in my Chemistry class, I didn't know anybody and no one would talk to me.Yet, when they noticed me drawing, the other students came to me asking if I could draw them things, and well, they became social towards me.
So my conselhos is to show them your talent, what makes you special (in the play especially). It sounds corny but that's okay lol. If they respect and admire who you are, I'm sure they'll talk to you. If not, they just missed a big chance on getting to know some one truly unique :/ and that's their loss.

^again, I apologize, my conselhos is not the greatist ^^;