Sometimes happiness takes a form of the dusty buss on the afternoon, with my best friend next to me on the seat we always sit at. Some days happiness is the complaining after my exam and chilling with lovely people in the school hall. Happiness has often been in the form of going to bed at 9pm but always staying up too late because one does not simply want to stop listening to music.
But those really weren't big things. Happiness doesn't come from life being perfect, it comes when you can appreciate all the things that are good in your life. You can't find happiness if you don't know what it is.
Well, what can you do to make sure you have something to appreciate? Do things that make you feel great, but step outside your comfort zone and challenge yourself at times. Always be friendly, but don't force yourself to hang out with people who make you feel insecure or get you into a bad mood. Per each negative thought try to make a positive one. Surround yourself with happiness and eventually it will find you too. Pinky promise.