It looks like you are having other distractions that take away your productive time. Probably a proper study methodology will help to plan your studying pattern.  Talk to your teachers for guidance and implement a study pattern with immediate effect.  Many children go through the torture of being criticised by parents and teachers when they don't academically perform. You can really bounce back and prove them all wrong, if and only if you work on your emotions and boost your confidence. Do not get demotivated by what others say, trust in yourself and bring out the hidden capabilities of yours