Ladies...shaving??

Okay! I have a question for all the girls here at mylot. I have read and been told multiple times that it is better to shave in the direction of the growth of my hair. I guess it's suppose to be better for your skin and reduce any irritation/razor bumps. But when I try to shave in the direction of the hair growth, the hair doesn't shave off! Does anyone else have this issue? Because my skin does get irritated a lot after shaving, so if this could help with that, I'd love to know why it's not working for me! lol Thanks!