I remember over 5 years ago, when I went for the job finding trainning, the first thing the instructor said was: dress up as if you were going to work in the morning, then start the day of job searching. I did that, and found my self-esteem shot up higher immediately. I don't know how long this would work because I found a job in a couple of months.
I am a firm believer that if we want to be treated as professionals, we would have to feel and act like professionals ourselves. It is "mind over matter". Let's keep up the positive attitude and apply it in our daily lives!