Sooo lonely and sad? Help me?

My friend and I fell out!I texted her to make up but she is running with annother girl who sent me nasty messages!my friend is now brainwashed and my other friends dnt wana knw me cus am quiet! Our friends party is in sat they r all goin and am sittin in on my own!my own 21st is next week !nobody is gona go? Wat will I di about these friends