I go with what Jan said first off. You don't have to jump into things with her instantly -- just get to know her and see where it goes from there. Second, don't write yourself off for something you can't possibly know. That is, that you'd be "bad for her" and all this because of low self esteem? I'm here to tell you that there are plenty of people out there with low self esteem but that doesn't mean they aren't worthy to be someone's gf or bf! it's an issue to work on but shouldn't exclude you from having a relationship! What if you could be the best thing for her right now? Sure it seems like a remote chance in your mind but there is that chance right? The next guy isn't necessarily and more worthy than you are to be her friend or more... Besides if she's giving you signals that's great!