i always think that i am right, but people think i am not!

Everyone is different and people view life from their own perspective and own experiences. The biggest problem with people is that they generalise. If one person had a bad experience with a Frenchman... that person will tell everyone that all Frenchmen are bad. With that sort of rationality... nobody is right and nobody is wrong. What works for you might not work for another person for various reasons. So you are only right to do that particular thing for yourself. But you are wrong to insist for that other person to do the same thing. No one is absolutely right because as the expression say "There is more than one way to skin a cat". Which mean that you can solve every problem with different solutions and end up with the same result. Except that some solutions are easier than some others. Some people like to do things the easier way... while some other always seem to do things the hard way.

I think that you should consider how often this happens. If they are almost always saying that you are wrong, it might be that your really are wrong. Try to look at the question from their point of view before you just decide that you are right and they are wrong.