More info is needed, because you need to supply your age, your country, whether male or female, whether you are comparing your height with others your age or to the national population. And we need mean and standard deviation, which I needed to look up. Well, to cut through all that I'm going to assume you're British or American and over 16 years old. I'm also going to take 5' 4" as average female height and 5' 9" as average male height, both with a standard deviation of 3". So your height would have a z score of (60-64)/3=-4/3=-1.33 (female) or (60-69)/3=-3 ( male). Does that look right to you?