I got a girl crush

hey everyone! i have a bit of a problem.
There's this friend ive gotten close to over the year. we've known each other for a while but just started to interact more because of a similar friend group. She and i have a lot in common, since we're both class officers we interact a lot. and we've been seatmates for a few months. I've really developed a crush on her. Which should be ok, i've long identified as bisexual and this isn't anything new. but i keep wondering if she isn't straight and likes me back? When we go out, she certainly has that lesbian aesthetic with flannel and doc martens. She's talked about finding girls attractive before. She's also the captain of our volleyball team and is usually intimidating and cold. But she gets really affectionate with me: hugging me, holding hands and calling me sweetie (and other terms of endearment) all the time?? Of course i reciprocate because im attracted to her but i just wanna know if I actually have a chance with her or if im reading too much into her actions. Should i back off and try to get over her? She doesnt know im bisexual although ive dropped hints in the past. any advice would be great, thanks.