How to look uninterested in someone?

I seem to have fallen in love/have a crush on/ like (what ever you want to call it, im not too sure what going on at the moment) with a teacher of mine, and I know that being in the same room as him makes me nervous, so I stutter and trip over my words in class and will blush whenever he talks to me. How can I make it look as if I am not interested in him? The last thing I want is for him to feel uncomfortable because he can see that I am clearly interested in him. I will look at him more than any other student and point my whole body towards him without knowing, l also blush terribly whenever he talks to me, walks over to me or even just looks at me. Is there anything I can do to control this so he doesn’t know I like him?