Left breast a lot bigger than right?

Mine are different sizes.It is not really noticeable,unless I stand in front of the mirror with nothing on.I think it is common,though the part about needing a special bra,i`m not sure about that.If it bothers you that much,cosmetic surgery is probably the only option,but have heard of some horror stories with that to,so be careful,and really research the person you pick to do the job.