I'm a 42 year old disabled veteran and I can tell you that your life is not a failure because you are still trying and haven't quit. I have times where I feel like a failure too, even to this day. However, I remember that life is like a roller coaster....it has it's ups and downs, can be fun, and sometimes scares the hell out of you. It can give you joy and it can make you sick. The point is to keep riding it because although life is tough, you'll be glad you kept trying, even in the hard times.