too young to have sex?

Okay so I’ve been with my boyfriend now for over 5 months and I’m 15 and he’s turning 15 in July, we’ve been having sex for a while now together and I am very close with my mum so I told her a while ago because I felt extremely guilty and I’ve been on the implant for birth control for about 3 months now, both my parents are aware I’m sexually active however his parents are not! They are very strict we are not aloud in his room or anything like that, which I can completely understand however they are trying to protect us from doing something that’s already happened. My mum and dad want him to speak to his parents and tell them we have sex as they feel wrong for knowing and them not as it is underage sex. However as I said they are very strict and me and my boyfriend both worry if they find out I will never be aloud to see him again and I’m so worried😓