Well, as some people here are saying, I think it all depends on personal preference. If your breasts are giving you problems, I think that's a great indicator that you probably need breast reduction. Growing up I was a very early bloomer, which not only made me uncomfortable with myself, but also made my body look disproportionate. Now I'm 5'2", 105 pounds with D cups, but I got them back when I was around 12 or 13. Back then I received a LOT of attention from all the little pubescent boys, and I admit that, at first, I was flattered, but now that I've grown into my body and look more proportionate, thus I don't always have the problem of guys staring at my chest and not my face (not to mention that most guys I knew have to look down at me anyway). Right now I'm perfectly happy with my body shape and what size breasts I have, but I can see how going either way can make you feel uncomfortable or inadequate.
However, I think part of the whole "guys looking at girls' chest and not their face" thing can actually be seen as flattering to some girl. I know someone who has around DDD cups and she complains all the time about how she has back problems and how she hates how big they are, but she normally wears very, very, very low cut shirts or very revealing corsets and she talks about her problems when our guy friends are around. Despite all of her complaining, I think she likes the attention she gets when she points out how "too big" her breasts are.