after trying to explain Type A Personality in my own words, I thought it best to use Wikipedia lol

The Type A and Type B personality theory (or Type A and Type B behavior pattern) divides the population of humans into two groups, based on their personality characteristics.

People who fall under Type A exhibit characteristics such as being impatient, excessively time-conscious, insecure about one's status, highly competitive, hostile and aggressive, and incapable of relaxation.

Type A individuals are often high-achieving workaholics who multi-task, drive themselves with deadlines, and are unhappy about the smallest of delays. Although they may exhibit some or all of these characteristics, it does not mean that people with the Type A personality are incapable of showing love, affection or other types of non-pessimistic behavior. Many are also capable of "coaching" some of these behavior attributes with proper treatment and medication. Those who do not seek treatment have been described as stress junkies, and often display some of the following characteristics:

An intrinsic insecurity or insufficient level of self-esteem, which is considered by some to be the root cause of the syndrome. This is believed to be covert and therefore less observable.

Time urgency and impatience, which causes irritation and exasperation.
Free floating hostility, which can be triggered even over little incidents.

The Type B personality, in contrast, is patient, relaxed, and easy-going. They are also more creative and imaginative, inclined to self-analyze and evasive of stressful situations, and bad at coping when found therein.

There is also a Type AB or Type X mixed profile for people who cannot be clearly categorized and have a combination of both types of personality.