Im confused what to do with my crush --relationship advide pls

Background: so i've liked this girl (im also a girl btw) for half a year, but right now she is basically my best friend. She's from ukraine like me and we go to the same school and class, and we also hang out with another girl from ukraine from our class that we are slightly less close with. 

Right now everything seems so confusing. She casually flirts all the time with me AND with the other girl (which gets me so jealous istg) and I ofc flirt back, HOWEVER, she has a very weird personality. i would say similar to Wednesday from the Netflix series. She's often cold and doesn't like touching sometimes to the point that when I had to hold onto her shoulder for a bit today because my head started spinning, she told me to stop touching her and touch the other girl (which I'm fine with as long as I don't fall or faint). At the same time, she can touch people casually when she apparently feels like it and sometimes even seems as though she tries not to touch me on purpose. Now, I'm a very touchy person and very touch starved so I always like to hug, cuddle, play with people's hands, etc. so resisting from any touch with my crush is HARD but I still try for her. 

Back to the flirting, I always feel so amazing when she gives me casual hints, but then treats me completely differently the next day. Recently, we went on a bit of shopping and she said some sus stuff like she wants people in our class to assume we're a couple or smth and we decided to give each other flowers (hand made) for valentines day (I also made her a mini painting). Then a few days after that in school she said she doesn't want to be in a relationship because she's busy and doesn't have energy to talk to people after school (I was so sad after that smh) and I kinda had to agree with her even though I have plenty of time and energy for dating rn. 

Im planning to tell her I like her and ask her out on valentines day, but now with all this hot and cold attitude that has made me obsessed in one moment and deciding to forget her in another I really don't know what to do and I cant tell my friends either. I also don't want to lose her as a friend because I think that the flirrty interactions are fun but they'll probably stop if I confess, she'll probably only flirt with the other girl..

So please help me bc I want to be with her so bad but the constant hot and cold attitude makes me question everything so much (istg she gives so many hints sometimes but then its like I'm disgusting to her or smth).

tl/dr: My crush is hot and cold and I don't know how to confess or it I need to even do it so I just need advice or an outside overview