How to figure out if a girl likes you if your a girl

ok so im 14 almost 15, bi, in high school and I am crushing on this girl but idk if she likes me back shes one of my friends but were not like close besties. im not sure if she is also bi I think she is cuz she acts like it and one of my friends told me she was but im not sure. so anyway im not sure if she likes me. she is always walking and standing close to me,she looks me straight in the eyes when we talk, she smiles at me alot, she is always making excuses to rest here head,legs and arms on me and she likes sitting on my lap and putting her arms around my neck and in class every time I look over she is staring at me and she makes her hands into a heart sometimes but im not sure if she means it or is just being friendly. also we go to 1st hour together and when we get out we walk together to our next class but everyone else goes the opposite way and today she asked me to put her necklace on for her and so I was helping her put it on (she had it turned in the front) and she just kept staring at me and smiling and after I got it on her I think she got nervous cuz she said she was gonna go the other way to class. but I have always felt in a good way about her shes nice,sweet,kind,cute everything but she is always puting herself down and im trying to make her stop doing that to herself shes great no shes not perfect but shes perfectly imperfect. so she doesnt know im bi though so im not sure and most bi people in my school where it says interested in on facebook will just leave it blank and I checked hers was blank so I think shes bi. but I really want her to be with me . if shes bi I will so go out with her even though im not all the way out of the closet in school and she isnt eather I would gladly hold her hand when we walk down the hallways and if she wants to hug and kiss her. im labeled like emo/scene. im kinda tomboyish but I got out of guys clothes this year I like skatboarding but havnt got to do it in a while. I really wish she would give me a sign that shes bi. cuz even though im bi I dnt really like guys that much I lean more towards girls and the only guys I find attractive are emo/scene/skate/punk rocker . but if you guys can help me I need to know anymore signs that she is bi or likes me before I ask her out. and I need to know how to tell her I like her.so if you guys can help me thanks.

neat, but if she is bi are you sure you agree with that? I would really consider all of that. She is bi because of lust or because she does want to love either.

You are so young and do you know what you want love or just sex?

Yes it sounds like she likes you a lot. If you consider all the above and want to go for it.

Ask her out one date and see where it goes. Remain calm and cool.
Do not show off or anything. Just be you and treat her like a friend.
Better than yet let her make 1st moves, yet watch them kind.

If you are in love you want a girl who takes her time "Slow your row"
You really need to consider what choices you are making.

Go with whatever makes you happy and you think is right.
Does note thing might not work out later on, but more girls will come your way and they are tricky so be careful.

Don't invite her on a romantic date, but just have a meeting outside school. I think it is a better idea. For example ask her to come with you to look for gifts for a friend of yours or something like that - I mean, I bet you know what could you possibly go out for. This would give you the opportunity to be together alone and also to touch the topic about sexuality in some hidden way. Good luck.