I have a "girfriend" and i think she likes me, she asked me to "eat her" I don't know if I should!

The fact you don't know if you should is a strong indication that you know you shouldn't. How many others have done that to/for her? STI/STDs can be passed on that way.

How old are you both?

I would not recommend anything so intimate with someone who is just a friend. How long have you known her? What is her sexual history? What is yours? Are you ready for your technique and ability to be discussed with her girlfriends?

Beware. Run!

Well were both 13 and we have never tried sex before and I've known her since I was like 4 and she asked me so I kind of want to but at the same time don't want to, so do I choose what I want or don't want to do!

"do I choose what I want or don't want to do! " - most certainly, until you are married. Even then these things should be discussed lovingly.
It seems strange she should ask you that out of the blue. How did the question arise? What led up to it? What other sexual activity have you done with each other?

Well, we were just talking and she said "if you and I were legally allowed to have sex, would you?" I didn't reply and she just asked me to eat her, and then I kinda froze and then she said it would make her feel good and other stuff, and I admitt I kinda have feelings for her and I kind of want to do it, and we don't have any other sexual history or her bringing up the subject.

This is way too fast. You need to get to know each other first as individuals - your hopes and fears, likes and dislikes, standards and expectations. Sex is more than just an adult activity to engage in when you are old enough. It is a bonding activity - it joins two people together. It is more than just intimate, but it is intimacy, and you have not indicated any signs of emotional intimacy. Indeed, there appears to be no physical intimacy of touching until this suggestion.
So ask yourself why she asked you to eat her. What was on her mind? Where did she get the idea from? Why does she think it would maker her feel good? Why this over caressing, masturbation &c? What "other stuff" did she talk about?
"kinda have feelings for her" is not enough for this sort of intimacy. You need to take your time. You have to more than "kind of want to do it", and you are not to feel pressured into it.
Talk to each other about your friendship.
While many your age (and younger) do get heavily involved in sex, it is best letting the physical side not outrun the emotional/spiritual side. Where are you from? Are there any cultural/religious implications?
If you start with such intimate interactions now, what is left for when you find that someone special? What is left for your marriage?
Stay strong. Think of the future. Don't do anything you may regret when you are older. Whatever the cost
Hope this helps.