Hi gaanglatihan,

That infamous pinky-stretch comes more easily to some than to others. While of course we could all probably work towards stretching and expanding the range of our reach, there are also just some anatonmical differences between one guy-or-gal's hand and another.

I too find the pinky-stretch challenging, even after all these decades of playing! Make sure and experiment not just with the stretch between the fingers, but also ask yourself if there are any minor adjustments to the angle of your left hand that help when you get into tricky spots. 

If it really drives you crazy, you can try a shorter-scale guitar, perhaps a 7/8 size. 

Best of luck to you! - Lisa