Who here has been single all their life.

（´Д｀;;) i get really nervous around girls for some reason, especially when i like them. Is it game over for me?

I think girls see themselves as warriors of romance.  They look for a challenge with great rewards, and guage their happiness with the magnitude of the reward and difficulty of the struggle to obtain it.  It's the yardstick to their worth.  Just like how we guys brag about winnings in poker, our alcohol tolerance, etc.

Romance is a safari to them.  They want to bag the big one, and the harder the fight, the better the experience.  But if the fight is too hard, or looks impossible in the beginning, they give up.  I think the analogy works.