Must just need practice then. I'm all over the blooming place and the opposition seem to be on top of me straight away when I get the ball.You can use it to apply pressure and to intercept/block the next pass, or alternatively switch to that player when they're close enough and you can perform a tackle. It's pretty integral to defending.
Hopefully it'll get easier when the game launches properly as I keep coming up against teams packed with the best players in the game even though I'm in Division 10.