Recognize that you are not seeing the entire picture. Even with Skype, there are a LOT of things you are missing. After all, if you're feeling down (or she is), you can always just not connect, right? There is always a way for "something" to come up. And so you are not seeing this girl at her worst, or when it's not convenient for her to talk. And the same is true in reverse. Dating is already a "best foot forward" type of situation to begin with, and distance and online stuff only compounds all of that.
An enormous difference is made when you meet someone. It is an investment of time and money. But as Roger has hinted at, if you meet, you are rather likely to seize the moment and sleep together. It can turn into a multi-thousand mile booty call. Not that there's anything wrong with that, but do know the facts.
Can people fall in love with the distance and all? I won't tell you it's impossible; we've got a couple here who did just that (she's Canadian, he was in Ohio when they met; they now live in Toronto). But understand that they are far older than you are, and so they did not have teenaged angst on top of everything else.
Meet first. Decide on love later. Don't rush it.