Why did Otho commit suicide during the civil war of 69 CE?

The Roman emperor Otho committed suicide in April 69 CE following his military defeat at the Battle of Bedriacum.12

After seizing power by orchestrating the murder of Galba, Otho faced an immediate challenge from the legions in Germany, who had declared their support for Aulus Vitellius. Although Otho acted with determination to mobilize his forces, the Vitellian army proved to be stronger. Despite advice from his counselors to delay and regroup, Otho insisted on engaging the enemy. Following the decisive loss of his army near Cremona, Otho chose to end his own life rather than continue the civil war, effectively ceding the throne to Vitellius.12