I find that all the 5 issues although not many of us may experience it, are still real and that they exist. If they are not managed properly, drastic changes may occur in that person and this might even lead to suicide.
From reading the 1st chapter of the book, i know that only 1 in 5 people experience depression. Mainly, it's about feeling down for a day or so, but we resume our daily lives after that. Depression is something that may lead to suicide or self-injury if it is not handled well.
I find that loneliness only occurs because of yourself. Sometimes, it may seems that no one cares about you, but in reality, people do care about you, but maybe you just decided not to mix with them or you think they don't understand you.
~No comment, but this maybe something we might experience in the future~
Being different from your peers :
I find that being different is actually a good thing. No 2 people in this word are exactly alike and that we are unique and special in our own ways. This is what makes the world a more interesting place. Although some might feel "different" if they are not in "trend" and may risk loosing their friends, true friends like us for who we are inside and not hate us for being different.
Having to put up a front :
I find that this is actually related to the above of being different. If you are fine with being different, there would be no need to put on a face. Maybe people put on a face to gain more friends, however i find that true friends like us for who we are inside and not for what we may seem to be.
If you feel any of this, talk to your parents or a trusted adult like a teacher ect. After voicing out you problems you would know what your real problem is and adults would be able to help your from there.
Overall, i find that these things would only happen to you if you have a low self-esteem and have little faith in yourself. Self-esteem is therefore very important and we should learn to believe in ourselves more.