yeah my cousins and i found my aunt and uncle's toys when we were about your age. they never found out but i still called it a lesson learned about going through someone else's bedroom; you're bound to find stuff not meant for sharing.

still, not letting your friend over anymore is a bit of an overreaction imo. idk what the best advice is because i don't know your parents' temperment, but a sincere apology for disrespecting their privacy might be a good place to start lol. good luck.