HELP! me and my bf were caught together!?

Okay, so im 13 years old and my parents are asain... they are against me dating.. so ive been secretly dating this guy for like 5 weeks now and its march break for me right now, and my oarents are at work till 5. Me and my boyfriend were just making out but then somehow it got upstairs.. i was in my room and he was me.. suddeny the door FLIES open and my dad sees my and my boyfriend, me, and me nothign on but my lacy red bra... he sorta straes at my for a second and then says omg and shuts the door... my mom comes home in 3 hours.. what shoudl id o.. hel probably telel her !