Hello Friend, Good that you are seeking a help. Negative thinking is a sign of anxiety. You may be thinking too much about something in future or having some fear or insecure feelings. Try and control those thoughts. Divert your action into other interests areas like hobbies, friends, social activities. Then automatically your negative thinking should reduce. I know it's easier said than done. If require taking some counselling support learn the ways to be positive. Feel free to reach out to me online for further evaluation and recommendation.