guys think im cis

im at a new school and have been talking to some guys online, and they think im cis, im pre t and pre surgery.

im moving into campus next week so will be around them 24/7 and am scared of them finding out, most likely if they see my binder or see my reluctance to take my shirt of. im scared of situations where they'd ask me to take my top of in front of them, what would i say? and what excuses would i have for the binder?

luckily im getting top surgery in 2 months but 2 months seems a lot to hide this. does anyone have any advice on how i can get round this?

thanks