My problem with lame is that it tends to be a way to cut people down including youself. Pretty much comments involving lame tend to come out as pretty lame most of the time.
Generally be easy on people and hard on problems. Better to be more specific or accurate or say nothing at all.
As for you, stop cutting youself down with value judgements. Instead just say to youself … an opportunity for improvement. And be more specific about your concrete action plan.