Yes, there IS something seriously wrong with you. You get infatuated by a FB girl who lives in another country, take the whole thing far too seriously and get bent out of shape when it (not surprisingly) doesn't work out. It should have been you with her? Pfft indeed. Mate, you've lost touch with reality.
Unfriend her, accept that the idea that she ever could have been a girlfriend was complete folly and move on.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.