If you have good overall health you are blessed anyway. Do you have physical pain? Think of people that aren't born healthy and think of you how lucky you are to live in a functional body without pain. That reason alone should make you think positive about life. I used to be slightly depressed from time to time, but listen, being depressed is a stupid “habit“. The more you are depressed the more you are getting depressed. It sounds stupid, but it is the truth. Be happy, there is no reason to be depressed. Pro tip: start a work out routine.