I’m not allowed to get skincare products, what do I do ?

So basically I have been getting acne on my face for a while now, but I’m not allowed to buy any skincare products (including a simple face wash) because my mom thinks it will mess up my face. I’m left to use shower gel on my face and it makes my face really dry so idk what to do. I’ve tried using my older sister’s stuff but she notices and gets really mad at me lol

Ik there are worse things but it’s kinda bothering me now and idk what to do. Any help?

Edit: thanks for the advice guys :-) I think I’ll just stick to warm water for now