First things first, depression is a real mental illness, etc etc, it can't be cured easily. However, a lot of people nowadays suffer from minor depression. They aren't committing suicide, but they aren't happy.
Curing this is very simple, but it will require you to change a few things.
-First, have goals for your life. My goal is to become a real estate investor, retire by 30, travel around the world with a woman I love for a few years, and then have a few children.
-Second, find a purpose for your life. This requires time. Your purpose should go along with your goal, but a goal is usually for yourself, and a purpose is for others. For example, my purpose, if my goal works out, is to teach others that there is more to life than working a crappy job until 65 years old. I want to show people, specifically teenagers, that there is so much more potential in their lives. I want to target people who are NOT already seeking out help. They will find help by themselves. I want to help people who have no idea that they can be happy and successful.
-Third, make relationships. You should have at least one person who you can talk about ANYTHING with. Share your problems, connect emotionally. You should also have people who you simply enjoy being around. Have a few mates that you go out with just for fun. MOST IMPORTANTLY, don't seek out a girlfriend/boyfriend. Work on improving yourself, and your life, and a girl will come. Ignore all the alpha/beta nonsense, and don't have sex with people just cuz "feels good."
-Fourth, look forward to the future. In my future, I see money, influence, a loving spouse, smart children, and I see myself helping other people achieve their goals. Why would you be depressed if you could have all of that in the future?
-Fifth, take action now. I am still very young, but I am taking steps towards achieving what I want. I am taking steps towards finding the perfect life.
These are very simple steps. Look forward to the future, and there is no reason to be depressed.
Now, the Mousesports game has begun, so I must depart. Good luck on your search for happiness!