How do you get your parents to let you start dating at the age of 13?

Well, I like this guy alot and he asked me out. But I am not allowed to have a boyfriend and I already asked my parents if I could and they didn’t give me an answer. I really like him but I want to be allowed to have a boyfriend. The only problem is that I said yes and I’m trying to keep it a secret. I need your help alot.