The feeling inside is not a nice one - it's a feeling of defeat. Your inner battle is already lost - you feel like giving up. It's even worse - you've lost this battle many times before.
So the most common scenario for a lot of people is to flee. Go do something else, something easy. The problem with this is that the feeling of emptiness is even greater after that. You say to yourself: "See, I told you."
But at least one time all of us have taken a different path - instead of giving up we fight. At least once we have said to ourselves, "OK, I don't have the courage. I admit it. But I must practice no matter what." And you do it against all hope.
This unpredictable action of courage is so important that it changes the course of your life. You stop floating down the stream and start swimming against the stream.
If you have done it once, it's easier to do it again.