I like this one girl and she knows but idk if she likes me too?

i told her last month and at first she was cool with it(shes bi btw) but now its like shes not interested or whatever. i would hug her and im trying to get to know her better (weve known each other for 4 years but we were just acquaintances) i write her one page letters (im in hs so its normal and dont hate please) but she would reply with half pg letters and a drawing with us 2 (not holding hands or anything) and i would text her but she doesnt reply and when she does....its like 1 word texts. my friends are telling me to tell her how i feel but thats the thing...i an a weenie and i cant be