I dont understand women clearly

Women aren't a separate species. You don't understand humans.

I am finding it hard not to be completely upset at this girl, and its hard to pretend I am content being just friends

Why are you upset with her? Because she doesn't want to fuck you? She is 100% allowed to choose who she invites into her pants, and you don't have an invite. Getting angry at her over it is pointless. She doesn't want to date you. Doesn't matter what the reason is. It changes nothing.

If someone gave you a magic mirror right now, and you looked in it and saw that your crush will never like you back. That in three months time, she gets a boyfriend who she really likes. Then would you still want to be friends with her with the full knowledge that it will never happen? If the answer is no, then stop being friends with her. Gently fade away, because it's better for both of you. If the answer is "yes" then work on yourself. Stop pouring your worthiness as a human being into the expectation of a relationship. Appreciate her for who she is, rather than as a date. Laugh about things. Enjoy them with her. Stop planning and thinking and working to try and change it into a relationship which she doesn't want. She would have said yes to the date, if she wanted to date you. She doesn't. Working to try and change her mind is going to nothing except cement that you can't be trusted as a friend, because you don't want to be a friend.

in all honesty I went out of my way to be a great friend to this girl, and it sucks to learn that she just isnt attracted to me

So you're saying that you would never have been a good friend to her if you thought there was no chance of a date? Because that's not a good friend. It's not flattering to her, and it's not painting you in a good light.

Look, if friendship with this girl isn't enough for you, then stop seeing her at all, because she wants nothing else, and you're not changing her mind. There's no big romantic conclusion where you force her to recognise how amazing you are, and she falls into your arms.