How do I stop having a depressed personality?

You do not say whether you are working or not. Maybe you are still studying. But you need to plan some fun things with your friend's each week to make your life worth while. Make sure you are around positive happy people. Make sure you portray a happy image as that's what people see. No one like a sad person, they all like to be around happy people. Make sure you treat your self with some pleasure in your life then the next week can be OK. Keep in contact with good people, it will help. Take care and good luck.