I understand your problem.
Feeling tired happens with everyone and it might be more with you and it differs from person to person and it totally depends upon there work and the stress they are undergoing at their work place. So getting tired easily is an iindication that which is given by body that it isn't getting enough nutrients to keep you active. To be active body needs proteins and minerals and vitamins. And that you get from eggs, meat, fruits and vegetables. Your protein input should be grams equal to your body weight. Have one or twon fruits for vitamins and minerals.