When you have something deep to discuss, or you have something hard to say, and you have an overwhelming sense of relief because you realize the current situation hints that it might not be the best time to bring things up, chances are it’s just an excuse–only in your mind–to avoid the subject.
If you frequently assess the situation, with regards to an ongoing issue, and always seem to come to the conclusion that the time isn’t right, you may want to ask if there ever will be a time that’s better than the present.