the ins and outs

My life is typical. Life is typical. I have a lot of good things happening and a lot of bad things happening. My problem is that the negative things have so much more power. I can easily say "I'm having a bad day." I could count on one hand the times in my life I've said "I'm having a good day." I've never said "I'm having a great day," but I often say "What a horrible day." Why is negativity so strong? Why does it hold so much more weight? I don't understand that lack of balance. Buddhism says that life is suffering, so perhaps happiness is rare for a reason; we must suffer constantly in order to truly enjoy the good times. Otherwise, life would be really dull I suppose. It's just dealing with it, I guess.