I am 15 and i am tall 177 cm tall, how tall will i be when i grow up?

No one here can possibly know how tall you might be.

There are far to many variables, none of which know any about you.

You'll be at least 5'9".

You'll most likely be as tall as the rest of your family. Height is genetic, though diet and general health has a bearing on it.

We don't know, you could grow more or not but depends on your genetic, I am female and I am the same height now at nearly 60 years old as I was when I was 15 years old.