they aren't there to catch you in something. idk. we def. give off body language but i don't think of it as a 'tell'. your t will pick up that you're nervous or that you're tense or whatever. and if you are scared then he can help you work through that. let yourself just 'be' in therapy. i've discovered that 'normal' is quite an extensive range. as you get more comfortable with your t, it'll even out.