Well, you’ve asked a few different questions and I’ll do my best to answer them all….
First, there is no quick fix for getting over someone you’re in love with. On the other hand, the minute you meet someone else that you’re interested in and attracted to, it will become much easier. So, it is vitally important that you get out there and start meeting people. (I have addressed your shyness issue below.)
Second, if you still have a way to contact this girl you may want to consider biting the bullet and asking her out. Why? Because if you don’t you will always wonder, “what if”… “what if I had asked her out”? “What if I had told her how I felt”? etc. Yes, calling her up and asking her out will put her on the spot, but that