I'm going through that right now actually. I'm not jumping to conclusions, but it may be signs of depression. If this is just a question, then I believe that's the best way I can answer that. Personally, I feel like I'm not wanted anywhere, I'm hated by everybody, and useless pretty often; but hey, don't sweat it. It might be normal for some people...
As you hit puberty and get into the world of being a full-fledged adult, your body and your mindset begin changing. Mentally, you no longer have the same "freedoms" of being a child, and for a long while, your previous mental image of the world conflicts with what you "know" you should see and accept. Also, the chemicals in your body begin to react differently with each other on a much deeper level than just making body parts grow and allowing you a burgeoning attraction to the sexual beings of your choice. These chemicals can easily butt heads with one another, and it can cause intense feelings of depression, paranoia, "love," lust, anger, sadness, happiness, etc (continued in comment due to character count- sorry about the disconnect).
Not only do the chemical changes create imbalance and disharmony but they create stronger more intense feelings. (ex. angst, strong sexual desires etc.) Which set you apart from the different generations (children, adults, elderly etc.)
The reason is also social too: you are in between childhood and adulthood. A time of growing, having fun, playing and enjoying life (childhood) and a time of more responsibility, greater expectations from those who love you and maturation (adulthood)
It is not easy being sandwiched in between both of these milestones. It may sometimes feel everyone is against you or nobody understands you. But rest assured you are loved! Sometimes its easy for your parents to forget what it was like being a teenager or for younger siblings to not understand what you are going through, even peers may not always understand (everyone experiences their teenage years differently).
Try reaching out to a compassionate, understanding adult such as a guidance councillor or a mentor. They can help you create balance in your home life and also help you get through the changes within your own self.