That's true. The harder you try, the more 'difficult' or impossible it may seem.
A guy friend of mine once used to date a lot of women and I've always marvelled at that coz I mean, like wow...where'd you find the guts to ask that many women out?
He sat down with me one day over lunch, calmly looked at me over the table and smiled slowly, telling me it isn't like he was always successful the first time he asks a woman out. What I've seen is the number of times he's succeeded. What I've not seen his how many times he fell.
So....have at it! Ask the next girl who catches your eye out. If you fail, don't let it thump you down, k? Sometimes, you gotta fall a few times before you get it right...kinda like learning how to ride a bike. Now how many people can say they've learnt how to ride a bike without ever falling? You just gotta pick yourself up and try again. And be brave enough to try again