Negativity

I just want to know one thing...... I suffer from depression for several months out of the year and even in my darkest hour, I try so hard to stay positive.  My glass is always full, even if it is empty, and I know things are always going to get better.  Some people are so negative.  I just want to know....if you go around saying how bad things are and how they will never get better, do you feel any better???  If not, quit telling the rest of us who are trying to be positive.