Erm, I'm sharing a laptop with my mother. I just decided to create my own user account. But I find that whatever I do in my personal account, it also changes in my mother's account. Example: I delete a file that doesn't belong to me on my account, and on my mother's it also disappears.

What can I do to stop this? I want my own account and be able to add and delete files without affecting my mother's account. Help me please.