Girl best friend advice?

So my girl best friend (18F) and I (19M) have been hanging out more often and I can't tell if she likes me. She constantly smiles at me and laughs at a lot of the things I say but I'm always the one that has to initiate to a hang out. She always suggests ideas but is never the one to organise them, but anytime I ask her to hang out she has basically always said yes and is always really keen and excited. Neither of us have ever been in relationship before.
I know she has told her friends and family about me. Her friends started following me, and she remembers all the fine details of things that I tell her about me. We've been friends for a few years now and are both quite shy. She has met some of my friends but I haven't met any of hers. There has never been much touching going on, only a few hello and goodbye hugs, but I haven't initiated much physical contact, and she was the first one to initiate physically.
I get quite nervous before seeing her because I like her but once we are together I feel fine and in the moment can't tell if I like her as a friend or something more. We always pick the same classes together but her behaviour seems wishy washy. She doesn't really text first but I think this could be due to her shyness. But then when I'm around her she playfully teases and touches me and I can tell that she enjoys my company.
I enjoy being friends and want to continue that but cannot decide whether I should try to pursue something more or tell her that I like her, as I don't know how she will react. Is it better to improve our friendship first? I don't want to be putting all the effort into the friendship but I also want to maintain it as I enjoy seeing her. She's giving me really mixed behaviour, which makes me doubt how she feels about me.
I haven't had many female friends before and don't want to ruin this friendship. It takes me longer to get comfortable with anyone in general, but I want to still improve our relationship. Any advice girls?