I say everyone should believe in there selfs. It actually matters that you believe in yourself. Don't let other people put you down, have faith in yourself. When I didn't believe in myself I would never show it but my good best friends notice it really quickly. Cause of them I had more faith in myself. I'm slowly getting better at believing in myself. I would never tell my siblings or my mum about my problems because I didn't want it to affect them in anyway. Now that I let it all out I'm slowly improving. Just never let people think you are useless, show them you are way more then useless. I hate those type of people. They always like to play around with people as a joke but they never think about the other people's feelings. Everyone has feelings. Be confident in yourself.