Moreover, exercise only takes more than 30 minutes, and only aerobic exercise is possible to lose weight. Just like you, you are just exercising your muscles. Actually, I think yoga and dancing are very effective. Like I am 20 years old, I also practice yoga in college, meditate every morning and often dance. These are all aerobic exercises, and I insist on 1 hour every time. It is very helpful to keep fit, so I suggest you do more aerobic exercise, which can be found online. Otherwise, go to the fitness center and see what kind of plan they make for you.
One more thing, you are only 13, you can't lose weight blindly, you are still developing, you must balance your diet with protein, and you can't lose weight blindly.
If there are obese people at home, you should also pay attention to the possibility of heredity, so good luck ~