Are you just starting out? Because I also had problems with bending when I started to play guitar. There's not much else you can do but keep practicing and your fingers will eventually begin to go things that you never thought possible as they become stronger.

One thing that I noticed when I was learning to bend was that other better guitarists would use two or three fingers on the same string when bending. But it was a while before I was able to use that technique. Again, it just took practice.