It’s not fair – not fair at all. Within the first second of meeting someone they will have formed an opinion of you that frankly is then very difficult to change. It can be changed but often requires significant time and effort.
Human beings are wired to create their own opinion of people quickly, so don’t take it personally. Instead realize that the 1st second of any new relationship or meeting is in actual fact the most important – so be ready, and become the master of your own perception.