Everyone has their insecurities. Not everyone is born with a well proportioned body. I can understand why some people would choose surgery if they needed it. However, I can't understand those who are already beautiful and still going under the knife.
I personally find 34b's to be small but the look also depends on one's frame. Are you a small, medium or large framed person? I'm a medium/large and I have 38c's. I was once 38d and I loved it. They've shrunk since I lost weight. I miss my old size. I enjoy larger breasts. For me, they make me feel feminine and sexy. And don't we all feel that way about parts of our bodies?
For some it's the hips, or the booty, or the legs but whatever it is, it makes us feel sexy physically. Feeling sexy mentally is a whole 'nother topic though.
I think if you are responsible and outweigh the pros and cons of this surgery, hey, just do you. It's your life, your body. You're the one who has the feel comfortable in your own skin. Just be sure you're not doing something unnecessary to yourself.