I am obsessed with twins, it's weird I know. I believe I was a twin once, I don't care what anyone says about me not having a sister. 
People hide their true emotions all the time, fake their smiles, pretend to be happy, don't show their true personality to anyone. Truly underneath they are drowning and they are stuck underwater and nobody notices or cares but try to keep your head up and stay strong. Don't let people tell you differently than what you believe, no matter what. Don't let anyone bully you physically or mentally, push back and keep going. Stay strong, don't let anyone or anything break you into pieces and If they do then pick the broken pieces up and carry them proudly. 
Anyways bear with me, these are my first books and I am trying not to suck at writing these.