I need help!!!!! what can i do about this facebook issue?

[secret]

Ok, I have Facebook without my parents permission and yes , i knw its really bad. But last year I tried to talk to them about it and they totally avoided it! They didn't say I am not allowed to have it, but many of my friends have it. I am 16 years old. My parents are Nigerian so they are somewhat strict about social media. I want to ask them for it, but I am scared they say no. Then what will I do with the facebook acount. I feel like I am not disobeying them because they didnt say I cant have it. I also feel like if Jesus comes today, I will go to hell because of this issue. I hardly go on facebook,; I just wanted to have it so I can say"I have facebook". My sister says I shouldnt bother telling them because I have kept this secret for about 6 months.There is low percent chance that my parents will find out! Can anyone give me advice.