first time...

Homecoming night, me and my boyfriend both lost our virginity obviously to each other, but we are 15 we have been together for just about 11 months now. We've done it one other time since then and I'm really uncomfortable telling my parents because they're the type to tell his if they don't know yet and he doesn't know how they will respond to it if he told them. I feel really guilty for not telling mine but I'm really scared to... advice?