How to get over my fears?

Okay well I've been dating my boyfriend for almost a week now, and I want to tell my parents about him really badly, but I'm not supposed to be dating until I'm 16, and I'm 15. He's really nice and funny, but I'm scared my parents will make us break up :( They did it once because they said I went behind their backs and I was told to delete him from facebook, from my phone, everything. I haven't talked to him in like 4 years and I don't want that to happen with Fritz :( (btw thats his nickname, its Freddy in German. Lol.) What do I do?? I'm really confused