How to confess an embarrassing sin?

Hey so confession is coming up soon for my school again were heading down to the church sometime soon and i have a really really embarrassing sin that i cannot even tell you guys cuz i am so ashamed of it. so i was wondering can i tell the priest the less embarrassing ones first and for the 'really really embarrassing one' can i just say and i am sorry for all the other sins i have committed? will God forgive me even though i knew what the sin was but didn't tell the priest directly? Thanko's for your answers :D