Hopefully my experience/views will help you in some way or another...
IMO, deciding that you want to enhance what nature gave you is neither trivial nor vain, especially if you are changing something that has made you self-conscious or led to feelings of frustration or unhappiness. This I feel passionately about. As some others have already mentioned, ultimately you need to do this for YOU. We live in a time where medical science gives us the ability to improve ourselves. Having that ability doesn't obligate us to use it. But having the option certainly gives us more power and control over issues of our own self-esteem. Self-esteem was my reason.
It's important to realize that it’s unrealistic to make decisions about implants based on magazine photos or computer-generated images. It’s safe to say today's philosophy regarding the decision to undergo breast augmentation surgery should be reached by you and your plastic surgeon based on your own personal needs, desires, and informed expectations. Take your time. Learn the facts about breast enlargement. And then do what’s best for you.
Let's just say the guy upstairs wasn't all that generous when it came to my chest...I got breast aug about 1 1/2yrs ago and let me tell you, I luv the girls now! (34A to 36C).
The procedure is UBER painful, atleast for the first 5 days post. Then, it starts to get easier...you dont realize how much you use your muscles in and around that area (to do even the simplest things) until you get implants! I couldn't sit up, lie down on my own...it was terrible.

Being a side sleeper & lying on my back without choice was BRUTAL. Many a sleepless nights & the pain never failed to keep me up.
Decide what type of implant you wanna get...SILICONE/SALINE, I got silicone. (In a nut shell, Silicone feels more real, looks more real, Saline looks more artificial, feels more firm to the touch, HOWEVER: everyone's body shape is different, ask your DOC what he/she thinks is best suited for your body frame/type etc...implant size, shape, and surface.) My doc suggested going with silicone as I have a very tiny framed upper body, in turn Sili's suited my body better. Also think where you want to get the implants put in. Nipple, under arm pit or incision under each breast. The nipple wont show any scarring really, the underarm you would have scars fairly visible, and under the breast you would only see really if you lifted your breast as they naturally cover the scar. (I got it under the breast and the scars are hardly visible and hide under my boobies.)

Sit down & create a list of any questions you have so when you meet up with the DOC, you're ready to go and you dont forget anything! Make sure you do your research on the Surgeon. Im not sure about the US (I think it's American Society of Plastic Surgeons) but in Canada we are advised to check for a 'membership' to "The Certified Board of Plastic Surgeons" (If I remember the name correctly!) lol They typically have a certificate displayed in the office somewhere, if not ask, you have a right to know. Remember, the quality of a breast implant that goes into your body is as important as the skill of the surgeon who puts it there.

Keep in mind also, your decision in proceeding with implants is a life long commitment, and surely your doctor will remind you...as he did me. Every 10 years or so they do need lifting. Yep, it's everything all over again! In my case, I LOVE the size they are now, but I will be getting them enlarged a little more by the time I'm 30-35 or so.
I must say getting them done was the best thing for me, but definitely think it out 100% before doing anything and dont rush. There are so many things to think and decide on. It will change your life for the better and will need to be maintained so make sure you are ready to make that commitment.
Best of luck to you, and if I failed to mention anything, please feel free to PM me any questions!
Sandra.