I am a girl, 19 years old and my height is 5 feet 11 inches. I weigh 69 kg. I want to be 60 kg because I think I'm fat. Tell me what I should do?

You're kidding right. At 69 kg you are considered underweight compared to other 19 yo girls your age. You can download a growth chart from the center for disease control site and compare your height and weight on a growth chart. www.cdc.gov/growthcharts. If your doc has checked you out and believes it healthy for you to be leaner, seek out a counselor to define the best way to meet your goals.