Well I suppose it is a failed attempt if you set out determined to do something, then failed because of SI/nerves/stagefright/whatever, but it's subjective and everyone will have a different opinion.
Like for example if you went to a comedy club determined to get on stage and tell some jokes, but when you got there you were so frightened you couldn't do it, then you'd failed to take to the stage, even though that was your plan and the sole reason you went there.
But it's important to say that's not a bad thing or a criticism, it takes real courage to go through with something that we're hard wired to avoid at all costs, so it's not surprising that we so often back down from things that we fear, no matter how determined we were at the outset.
It's just human nature.