I work in collections and am feeling really bad about it how can I deal with it better?

I work for collections in gmac and since I do so well they've put me on a team where I call really past due accounts that are getting ready to go into more extreme collections a lot of the people that work around me on my team yell and I think are too harsh on people that can't make their payments, I try to be as nice as possible and just let people know I would really hate to see them go into further collections which I really would. I feel real bad though sometimes about it I called this one lady who got mad and sad fine I'll just pay my bill and not eat and I tried to tell her I wasn't trying to be mean but she hung up. Its getting to be a little draining on me I'm not the kind of person that likes to push anyone to do anything but my job requires I at least tell people of their delinquency status I won't raise my voice though because I know that isn't me plus doesn't set a very good example I don't think. How can I better deal with this, any advice?