Your qualifications do not really matter if you do not have strong social skills. Sounds harsh, but unfortunately this is the world we live in. People form opinions quickly, and in many instances, someone can form an opinion of you before you even have a chance to introduce yourself. First impressions do not begin the second you are heard, first impressions begin the second you are seen.
You never know who is watching you, nor do you know for how long they have been watching you.