How can a girl get taller fast at 20 knowing that i am 1metre65?

High healed shoes: If you entered puberty the same time as your friends ; your bone maturity is 18 yo or older there is little you can do to increase your height.A single x-ray of your left hand can be assessed for bone maturity.If bony maturity is more like 15 you might grow an additional couple of inches.Medicines won't help if the growth centers are closed/finished.

You are done growing: at age 20 so you are as tall as you will get. Try high heels.

At adult height: If you are 20 you are likely at your adult height. Most girls reach their final height by 14 years of age.