It is quite normal for your breasts to be different sizes and even to point in different directions. It is actually fairly uncommon for girls to have a pair of evenly matched breasts. Just like one side of your face is slightly different to the other or one foot is bigger than the other, your breasts are usually different to each other. This is most noticeable during puberty when growth is most rapid. Luckily, most girls more or less even out once puberty finishes.