I have no idea how to use my breast pump and my boob hurt :(

read the directions.

You're probably using it wrong in that case.

@kimberlyyyy, it sucks my boob but nothing comes out and they hurt so bad

Some people don't respond well to pumps try hand expressing

Make sure the speed isn't to the max start out slow

Try putting nipple cream like lanolin on before pumping. It works like a lubricant :)