Ignorant friend ;-;

So there is this one friend I have that always ask me to buy stuff online for her and she would give me cash.

Since we are in high school, it’s normal that she doesn’t have a credit/debut card.

The first transaction was good, but the ones after that made me feel angry at her.

For example, when the total is 27.45, she would give me 27 dollars. And when I told her that it’s not enough she told me that it’s just 45 cents short 😩

This has been happening many times.

(Do THE MATH if 0.45 x 10 or 20 is a lot of money) im not rich ;(

I was like b**** I went through all the trouble for you including wasting my time to order stuff and picking them up and wasting my money too.

Idk how to tell her to stop doing this, it’s driving me crazy.

I tried telling her that i dont wanna do it but she keeps on asking

I dont wanna lose a friend or money lol