There are hundreds of thousands of people who felt that same way at least once in their life time. And most of them made it and became winners in the end. A few gave up and were defeated, because they gave up, not because there was no way out. In fact, there is a way to successfully fight and defeat depression and there is a way to make it in life. There is help available.
Life is like learning to ride a bicycle.
You may fall many times, but if you don't give up, you'll eventually become a very good bike-rider. You begin learning how to ride by first getting acquainted with your bike, of course. You begin learning how to actually get on top of it, by learning more about it. You need to learn something about what depression really is and so get some understanding why you are feeling the way you are feeling when depressed.