Dropped my iphone now it has black spots

Been using an iphone xs max for 6 months and i took care of it like a baby all these days but today i fell asleep while using it in my study table and i dropped it TwT now it has a smol black spot in the left upper corner and idk what to do, too scared to tell my parents as they'll whoop my ass. Got no money to take it to the service center. Also saw on the internet that if i dont fix it, it'll grow bigger and bigger day by day. What should i do ?? He's my literal baby