Chin-Ups

Start off by doing negatives. That means use a chair or something to get yourself up where your chin is above the level of the bar. Then step off and lower yourself down as slowly as you can using your arm and back muscles (chin-ups work your biceps and lats). Rinse and repeat.

Once you get a bit stronger, you will be able to do a regular chin-up, and just keep working it from there. Good luck!

And conversely, you can also use the chair to assist yourself up for every rep. It'll be tempting to use your legs to push off, but you'll know when you're doing it. The goal is to work slowly at it so that you need your legs less and less. But there's no shame in doing it, and it can also be a safe alternative because your legs are there for support if your run out of gas in your arms and back.

Even many men are surprised when they find out that they can't do a single proper pull-up, despite the stereotypes that we're "supposed to be stronger than THIS!"

I know exactly what you mean girl!! i'm trying to achieve that also! Just ONE...lol I have started using the assisted dip/pull up machine...!! its still hard though..! im working on it!