Why do I feel so woefully inadequate for this world?

It is possible you have set goals unrealistically high for yourself. You possibly take yourself too seriously. Since you mention suicide, it means you are dissatisfied with the way things are and want it to change. It does not mean you want to die. It means you want change.

Life never stays still. Things are always changing around us and we too, are always changing. The bad times never last and neither do the good times. We succeed and fail both almost every day of our lives.

Talk a good long inventory of yourself. It is difficult to do. What are your goals? What time length do you allow yourself to achieve them? Are your goals really possible in that time frame? Are you being too hard on yourself? Your words suggest you judge yourself too harshly and too quickly. Try to slow down and let go of that tight rope you've got on yourself. Where di this self criticism come from? Were your parents strict and judgmental when you were young? You sound like you are your own enemy. Try to let this go some. The world is difficult enough without all the negativity you throw at your own self.

I think you definitely ARE being brutal on yourself. You are a worthwhile person. But you are not a god. You are a mortal human. We ALL have flaws and make mistakes that bring grief in it's wake, we ALL cry at times, And we ALL suffer guilt and doubt and discouragement thru our lives. But each of these things are counterbalanced with assets and incredible capabilities, and grace and hope and kindness. Turn that kindness on yourself. It is OK. You are worth having a break. There are always things to live for. Hope for a better life is a good one. Keep your hope alive. Tomorrow can bring something very nice. You need to allow yourself that hope. OK? Keep your hope. You are a far better person than you think at this moment.