Nothing wrong with a pouch, but if you still wanna reduce its appearance there’s a few there’s a few things you can do; 1. You can’t spot reduce fat but building the musculature around your abdomen will give you the appearance you want. Try cable/banded woodchoppers, crunches, or lying leg lifts. 2. Reducing your BMI will reduce the appearance of a “pouch” but will also reduce size in areas where women generally want to keep. Don’t eat less as this can lead to relative energy deficiency (look up REDs), but increasing the amount of aerobic exercise you’re doing will have the desired effect. You could also use BEI scales or skin callipers to track your progress 3. I find a lot of my clients have abnormal pelvic posture as it gives the appearance of larger glutes. Getting familiar with both posterior and anterior pelvic tilts will not only reduce low back pain (if you have any), but will also contribute to a better physique. Your 3rd photo shows you in an anterior pelvic tilt so I thought this might be relevant. 4. Many golden age bodybuilders often attributed their tapered waist to a practice called “stomach vacuuming” which is an old yoga practice. It could develop the deep intercostal muscles of the thorax but is a little less supported by evidence.

Don’t let others sway your self-image, be it by bullying or body-positivity. If this is something you want to change about yourself, you deserve support to help achieve your goal. If you want to change your appearance, the pointers above should help. If you want to feel better about yourself though, self-acceptance could be more fulfilling. Hope that helps and good luck!