I feel like she doesn't like me as much as her friends? Am I overthinking this?

I've been dating a girl for almost 9 months now and she and I haven't really done anything to like progress our relationship. I always feel like I'm the one who initiates things and I've brought it up to her and she says that she's just shy.

But like whenever I hang out with her and her friends she acts completely different. She initiates so much contact with them and she's only known one of them a year longer than me and that person is also bisexual and she hangs out with her a lot and touches her a lot.

I'm just worried that she doesn't like me at all. The last time I asked she said she wouldn't date me if she didn't like me but I keep thinking that she just doesn't want to say she likes this other person.

Any thoughts?