Entities are to strong

This is a really annoying bug where peaceful mobs are way to strong. What I mean by that is that they can push you around way to easily. When I'm trying to make a farm, I might only have 5 sheep, but they push me around to where I can't get out of the farm. (It's this way with and without wheat to attract the animals). As I was playing minecraft pc I realized they weren't that strong, so I was hoping you could please fix this for the next release.