I am scared to ask my mom to buy me pantyliners so can i just sneak one of her pads and use that and if you think that is bad can you just tell me if a pad would work as a pantyliner?

It's thicker than pantyliners. If you are dribbling urine or another substance the pad will get soiled and it wouldn't be sanitary to use it more than one or two days. It wpuld begin to smell bad.