You seem to have an inexhaustible supply of chakra, not because you can hold more of it in yourself than others, but because yours restores itself at an almost inhuman rate.
Pulling chakra costs no vitality or stamina. When you are reduced to 0 or less chakra, be it from spending chakra on a jutsu or getting damage to your chakra, you may spend 1 willpower to ignore the adverse effects of having 0 or less chakra. However, while you have 0 or less chakra you can do nothing but pull chakra until you have at least 1 chakra. If your chakra gets damaged while at 0 or below, or it goes below 1 again, you must spend another point of willpower.