I am definitely short. im 16 this year but im only about 156cm... but i dont thi!

As a male, you'll most likely continue growing into your early 20's. Don't fret it. You've only been in puberty for a couple years. Males begin at a later age than girls but also end later. Ever wonder why 16 year old boys tend to still look boyish than 16 year old girls? And 14 year old girls tend to be filled out more whereas 14 year old boys still look 10?
Pimples are common, but not usually a major thing in most males and females alike. Keep your face clean so you don't get blocked pores for starters. That will greatly help. :)
Genital hair tends to appear first in both sexes. The males voices change anytime within a few years after beginning puberty.
Give it time.. relax. You're average. Enjoy the rest of your childhood. Don't be in a rush to grow up. You can't repeat it.
Puberty takes many years!! For both sexes. Growth is normally the last thing finished.

Your height depends on a lot of things. How tall are your parents? Do you have the proper nutrition?
If I had this info I could have a clearer view of your situation. If you want to increase your height eat
more protein foods and exersise more

Don't worry, I know people who were average at the age of 20