I get embarrssed very easily around certain people/teachers?

-It's weird, cos I have a crush on this teacher so much I never stop thinking about him, but I won't see him ever again, or talk to him for a while because our year (7) is moving to the lower school site, long story And I'll understand if you didn't understand that bit ! But I do get very very shy around him and when he used to ask me questions in class, not very often, because he knows, I used to go so red, for no reason, he asked me a question! I went so red once that he never asks me questions any more, but does talk to me a lot :) Anyway, that'll be over soon, as what I first told you, he might be there but I don't know, But thats not just it, I am fine around female teachers and things, theres this other teacher though and whenever he asks me questions I go so red, I DO NOT fancy him he's about late 40's, he is my other Science teacher, I have 3, and one of them is the one I like and he is 25, but with those two blokes I just go red when they ask me things, and around maybe another couple of males sometimes, It's just annoying cos when say the one in his 40's asks me if I've finished work, I get a bit, you know, and I'll say it again, I do not fancy him, at all, but I like him as a teacher but he always stares at me and things and always asks ME the questions, but the 25 year old, doesn't stare at me, and doesn't ask me questions, although i am a science brainiac :L Please help, now, must get some information :(