Look at a homeless guy standing next to you, don't give him money just salute and smile to him, tell him how are you today?. Look at an arrogant girl, and laugh at her inside yourself. And look at another not a good looking girl and flirt with her with eyes and believe that she will go home so happy. Let the people who hate you, hate you, and the ones who are insulting you, insult you and believe that they are wasting their time. Win yourself and love someone who hates you, listen to these words without judging or commenting, and if you don't like them don't ever listen to it again.
And dance even alone in your room with the door locked and pretend that your toothbrush is a microphone and sing out loud. When somebody asks you about how you are, reply immediately saying "I'm really great" without even thinking and smile, that will make you really happy. If somebody insulted or offended you, put these words in your fuel tank to be the energy that is going to push you towards the future. If you found yourself lonely for sometimes that means you are unique , and nobody can judge if it's a good thing or not but you have to believe that this is who you are, this is the only you and you can't be something else.
Just love yourself and love the others,, be happy