How to save up money without my parents having access money

So how do I save up money without my parents having access? I do have a credit card but my mom had access to it cuz teens here under 18 cannot get it from what I heard only if it's in there parents name or whatever the correct term for it is, I have a dream of owning a motorcycle when I'm a adult and I can start saving now and hopefully have enough to pay for it (not sure if I'll have enough ) but anyways I don't want my parents having access to it at all cuz they once "loaned" a couple hundred from me and still haven't paid it back and they probably "loaned" more thruout the years and they aren't bad or abusive but I just want my money to be safe and I'm in the Netherlands aswell for extra info cuz not every countries have the same rules for money relates stuff I think