Self conscience about my teeth?

I am 35 years old and absolutely hate my teeth. Due to bad diet and smoking (have since quit in january), my teeth are stained and yellow. I am petrified of dentists as i had bad experience. I do brush and use mouthwash religiously everyday without fail, but it seems too late. I am not very confident when talking to people and it effects my whole life socially. Help please!!!!!!!