Well think of it this way. The past ones were obviously pursuing you because they both found qualities in you that they liked and wanted. So that should feel good. It's not luck.
As for the girl, just try being genuine. You'll never regret having taken opportunities to do something, but you will regret the what ifs. It's nervwracking, but just do it, don't think about it, force yourself to open your mouth and say what you want. Ask her how her day is, try to transition to a point where you can ask her for her phone number. Every situation is different and you should fel out what exactly to say but just be like, look I've sen you a couple times in here, and I thought you were cute, would you like to meet up after work or later this weekend blah blah blah. Then ask her for her phone number. Just try smiling and joking, make light of the situation.