The first step before any treatment is diagnosis, and a thorough history (how long you've noticed it, how it bothers you, any associated symptoms or difficulty, others in family who may have or have had it, etc.) and physical examination (skeletal, dental, soft tissue, both at rest as your photo shows, and with animation such as smiling) are the cornerstones for gathering information leading to diagnosis. Special studies (x-ray, cephalometric analysis) may also be indicated. It may be that an orthognathic approach to reduce your vertical maxillary height is appropriate rather than directly treating your lips. Consider personal consultation with a specialist in maxillofacial surgery.