My left foot hurts when I walk on it, it feels broke only on the left side and also feels bruised but I never dropped anything on it?

Foot pain. You may have a stress fracture. It really could be a number of things. Foot pain is not normal so get it checked by a podiatrist.
Foot pain. Sudden foot pain can be from many different reasons. For your age and gender, some common reasons are overuse, tight ligaments or tendons, inflammation, stress fracture, gout, etc. Can you describe the area and onset?