Being promoted from an employee to become a leader is probably one of the best experiences. From a single follower, you become someone in the forefront as you lead a specific number of employees.
Although you will never have to be productive yourself, you are answerable to someone higher if your employees are not as productive as expected. On the other end, you become the representative of the upper management and any concern of your employees about the management should run by you. You are practically a middle man now that you are a leader.
Handling employees and the upper management is often a big task for the new leader. If you find yourself in this situation, you will often feel the pressure. But do not make this as an excuse for underperformance in your team.