Please help me, I need weight loss tips...?

Sorry I am American and don't know what 21 stones is but it sound like you are on the right track. You need to eat at least a light beakfast as it fires up your metabolism for the morning. You have only been at this 3 weeks. It takes about 3 months to set a habit in place. Be patient. You will see results soon. Best of luck. You can do this!