Incommunicado

I've been talking a lot more lately and really trying to have conversations with people, but when I do, they don't seem to make any sense. I'll say "why don't you come over here and play with my cars," and mommy says back, "Lexi, are you ready for a bath?" Um, no, mommy, I want to play with my cars. Or at school I'll say to my teachers, "I want to go downstairs," and they sing back some song that has nothing to do with going downstairs. It's so frustrating. People do understand a few things I say, like "up" and "more" and "hi" so I don't get why they don't understand everything I say. It makes me so sad that I throw myself on the ground and kick my arms and legs a lot.  

Why don't you understand what I'm saying?