It is very very very very unlikely that pulling your lips changed the shape. Your body simply does not work like that. You don't get a loose mouth from taking big bites, you don't get loose lips from masturbating, sex or pulling them.
Your vuvlva is not there to look at. There is no Miss Vulva competition. In real life, women come in all shapes, sizes and colors. But for your partner one day, they will be the most beautiful lips he's ever seen, because they are connected to you, a wonderful and unique woman.
An operation is called labiaplasty. It is normally only done if there is a medical reason for it. Otherwise it is very expensive, and it can affect your ability to enjoy sex. There is very little chance that it will be done at your age.