Here it goes. I love this girl but I don't know if she loves me back, I told her how I feel about her, I really want to ask her out but I'm scared she will say no, this is the firt girl I really love, I was a about to ask her out but I froze. I'm 13 and so is she, I really need advice!

Why not just start with something simple like 'I noticed you really like science, me too". '
Mention something you have in common and see where that goes.

If you can't say it to her face to face. Send her a note. Or give it yourself. Don't be scared because you're going to keep wondering what if... right? If you think it could be too early, take time and find ways to hang out with her. Be casual so you can make her feel comfortable around you. Look into her eyes when you run out of words. Hay love.. the sweetest thing.

Hope this helps.

Don't tell yourself she might say no, it brings down your confidence! Get to know the girl! You might have a lot more in common than you think... You sound like someone I know. The best thing to do is ask her yourself. If you have a friend ask her, she might think you are a coward! Most girls hate that. It means guys are weak. Do what you FEEL is right!

From all the advice I got I think I'm going to try to know her more. Thanks everyone

here it goes. I love this girl but i dont know if she loves me back, i told her how i feel about her, i realy want to ask her out but im scared she will say no, this is the firt girl i realy love, i was a bout to ask her out but i froze. im 13 and so is she, i realy need advice!
13 is too young in really be in love. I think you are in love with the idea of being so close to a girl maybe. You need to experience more of life before you are in love. You are YOUNG, don't pressure her.