18 years old 190cm 130 kg can't dunk yet. They all laughed at me. How can I exercise and dunk successfully?

Dunk is mainly driven by waist and abdomen strength, calf and upper limb strength. I think your height 190cm. If the wingspan is normal, you should touch the height at about 250cm-255cm, and the dunk height should be above 320cm (305cm under the basket), so there should be a vertical bounce above 60cm. With the average physique of China people, such a vertical takeoff requirement is not very high. You are young and easy to gain weight, generally 190cm, at least 75kg. I think if you gain weight naturally, you can try to dunk (young people need energy most of the time and rarely gain weight), don't care too much about jumping training, and eat more high-protein things at home.