Is it possible to sway the judge?

I pressed charges on my physically and sexually abusive ex boyfriend and he accepted a plea bargain for 6 months in jail, which is not NEARLY enough time for what he put me through for 5 months. However, I am going to his sentencing soon and delivering a victim impact statement orally. I am wondering, is it possible to sway the judge into making it longer if I make my statement powerful enough? I feel that the justice system is not very justice and he is getting away with a slap on the wrist.