You are extremely light for your height. You should go to your doctor for an examination and consultation. This will establish whether your weight represents a problem with your health. A low weight can indicate a psychological problem. Has something changed in your life? Since when have you been eating so little? Are you feeling stressed or depressed? Discuss your problems with your doctor or a specialist, who will help you to resolve your issues.
You are light for your height. If you are healthy, things are going well and you are enjoying life, then that is fine. However, if you are often tired, depressed and lacking in motivation, or have been eating little over an extended period of time, you should go to your doctor for an examination, to rule out any health problems which may be causing this.