Be polite. Be yourself. That way, people like you for who you are.
Many of us mistakenly believe that it's wrong or conceited, to think we have any good qualities. We may spend a lot of time berating ourselves for our negative qualities, thinking that self criticism is the key to improving our performance. However, a constant focus on our supposed shortcomings can hinder our efforts to make friends with other people.
How can we have the confidence to make new friends if we think we don't have much to offer? How can we believe that others could like us if we believe our inner being is flawed? Or if we think we are too boring to interest anyone else? We may wonder what anyone else would see in us if we don't see any good in ourselves. In order for others to be attracted to us, they must be able to easily see our best qualities. If we focus on our good qualities we will have much more confidence that we have something of value to offer in a relationship.
If you wish to be socially successful, it's important to accept the fact that not everybody is going to like you under all circumstances. Not everyone is going to like the package you come in, especially on first meeting you. Every person has a unique pattern of likes and dislikes which were formed long before they met you. Don't think you have to condemn yourself as a failure if it seems that someone else doesn't like you.
If someone seems to dislike you, the reason for that dislike might have little or nothing to do with you. The person who doesn't like you might be fearful, or shallow, or busy or shy. Perhaps you and that person are simply a mismatch for each other at this particular time.
Don't take yourself out of the game by deciding that your flaws are bigger than your assets. In fact, some of the very qualities you consider to be flaws may be irresistible to someone else. For all the factors that might cause one person to reject you, there are at least...