Don't let yourself feel disliked.

- I second that. Those who constantly worry whether they are really really liked, will probably a) never find out for sure, b) worry about the opinions of people who are not the best judges, c) perhaps end up being disliked for that very worry.

The opposite, not to care for others' opinions, is even worse an idea. Nowadays many people can afford to live on their own as singles - but only few are really happy.

My advice, to you, myself, and all others:

• Act in a friendly and dignified manner whenever you can, even if the other person does not. It is their problem, not yours.
• Try to understand what other people really feel, think, and want, independently of your own person.
• Try never to feel sulky. If you are being offended or wronged, reject that clearly but without excessive aggression. Allow the others to withdraw as easily as possible.
• Explain your own actions and wishes to others, in a way that they can understand you.
• As soon as you find you are wrong yourself, or that your point is not worth a strong argument, withdraw quickly. Those who can say "sorry" are best liked!
• etc.

Following these advices will not make you happy right away, but ignoring them may make you more unhappy than necessary.

As for "Smile, God loves you!" or "Love yourself!" - not completely wrong, but often misleading. Love needs two things: a strong attitude and a strong effort. Both are not easy, for anyone.