In the midst of noisy chaos, be quietly confident, resolutely competent and inwardly defiant. When surrounded by people who are ridiculously negative, be ridiculously positive. So positive that you don't need to reason with them, persuade them or influence them. Quietly work towards proving (to yourself not even to them) that they are wrong and you are right. And if these negative people include someone you care, muster enough resolve that one day you will bring your success into his/her living room so that it can be powerfully felt by them. Don't ever hope to change others without changing ourselves first. There is a threshold beyond which they will start paying attention to what you say, do and how you live and love. So the task before us is to cross that threshold.