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It may not be right that your family members do not love you. Family members love is expressed in routine life by non verbal ways. They may not directly tell about their love to you.
Fighting with sibling is normal in early ages and these fights will become nice memories for your grown phase of life.
Apart from that negative thinking, low mood and poor concentration may be part of depression
, which can occur due to several reasons in your age. You may seek psychiatrist
help for that as it may affect study badly.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal