If it really is
true that people are carrying a negative opinion of you, then perhaps you should consider "why" and try to do something about it ... because most of the time people carry no particular opinion at all
about the people that they meet. It pays to try to be likable. To smile, even when you're just acting, because most of the time they'll smile back.
Originally Posted by Alfred Hitchcock's famous acting advice to Ingrid Bergman:
"Ingrid, fake it."
However, it is also quite possible that you are projecting
negative feelings about yourself, into how you perceive
that other people "think of you," which can become a vicious-circle waste of your time and energy. That's worth thinking about, too.
percentage of the people that you'll encounter are just "having a bad hair day" themselves. There's nothing that you can do about that ... except, maybe, to smile at them when you really don't feel the part. Maybe they'll smile back too. They usually do.