How can I eat healthier and still be happy?

Ever since I gave birth to my son 6 months ago I have been struggling with my body and self confidence. I was about 100 lbs soaking wet before I got pregnant. The dr’s told me to gain weight. I started to eat a lot more than I usually would. By the end of my pregnancy I was up to 140 lbs. 6 months after the fact, I still weigh about 135. I’m only 5’1 so although 135 doesn’t sound like much, it’s clear that I’m a little heavier than I should be.

Regardless of what everyone thinks a “healthy” weight should be, the point is that I’m unhappy with myself and need to make a change. My question is how can I stop stuffing my face with junk and still be happy. I associate eating with feeling good. When I’m bored, I grab a snack. When I’m stressed, I grab a Twinkie. When I’m happy, I celebrate with a bag of chips. Not to mention I never know when to stop. I eat until I’m stuffed. How can I make my mind stop associating food with happiness? How can I tell myself I’m not hungry anymore? Are there any tricks to help with this? Should I start looking at myself naked daily until I’m so disgusted with myself that I will choose not to go grab the carton of ice cream?