Lack of sleep – Lack of adequate sleep exhausts both the body and the mind., Stress and anxiety – Mental stress drains energy and also lowers self-confidence., Bad eating habits – Lack of nutrients makes the body feel weak and tired., Lack of physical exercise – A sedentary lifestyle makes the body sluggish., Negative thinking – Thinking negatively about oneself slowly destroys self-confidence., Hormonal imbalances – Like thyroid or vitamin D, B12 deficiency., Depression or anxiety – These mental conditions can lead to exhaustion and self-doubt.