listen,
you are 26 years old... you can't do 20 cm unless you wanna spend the 10-15 years recovering
forget this idea... you are 150 cm, which means you will always be short, even with ll... in fact even you do 7 to 8 cm, which is a lot, you will still be short
it's up to to you to decide if its worth being getting ll to be 157 instead of 150
but regardless, you will still be short, so a better idea is for yopu to start focusing on other things in life, and try to be happy