Depression creeps upon you quietly. At the very beginning you struggle with the little things but you usually try to ignore them. "It's like a headache" you'll tell yourself. It's temporary and it'll pass, it's just another bad day... but it's not.
You're stuck in this state of mind. You get used to puttin on a social mask and you continue to live among other people because that's what you have to do, it's what others do. However, the problem does not go away. You struggle to put on a play everyday and it starts to cost you more and more. That is why you fall even deeper and that's when you slowly start to back away from friends and family, sometimes conpletely shutting them out.
All satisfaction is gone.
The little things that used to bring you joy are now worthless. Even the simplest tasks become painful. Now, why would you keep trying if nothing makes you happy anyway.
All of this makes you feel even worse and you get caught up in a vicious circle. Suddenly you find yourself living in slow motion. Days become indistinguishable; just white noise, just... heaviness, filling your mind and spilling all over your body. You feel as though you will never be happy again.
You continue to back away and destroy relationships. You're ashamed of everything you've done and everything you haven't. There is a part of you that wants to make things right. A sudden positive upsurge wants you to go out and meet people but it's all very short-lived because you know it won't work anyway.
Things that make your friends excited leave you indifferent and you become aware of the huge gap that lies between you.
Another failure is not an option, so in the end you choose to be alone in your comfort zone where no one asks you questions.
The low self-esteem and lack of purpose becomes unbearable you finally realize that you can't go on that way and two things can happen.
You either decide to get some help or you might attempt suicide.