You as a being comprise four personalities which are: SANGUINE, PHLEGMATIC, CHOLERIC, MELANCHOLIC

Half of human personalities have distinct features which are hosted by genetic factors. Personality itself is built on two different traits; character and temperament

Your character traits comes from your experience. Eg "parent habit, what your society consider to be normal"
While Temperament, is the biological based tendencies that you  inherited from your parents. It is your ability to think and feel in certain circumstance that appeared from childhood.
Understanding Temperament makes you to understand others and your personality better.

Below are the types of Human personalities

SANGUINE
Sanguine personality is influenced by a chemical called DOPAMINE, which makes them to be intensely curious and creative. Their curiosity can be expressed in their love for reading about new knowledge. This type of personality know how to enjoy money, luxury. The Sanguines love to take risks just to create new things. However, more than any other they are more susceptible to alcohol,drugs, gambling and risks

PHLEGMATIC
People with PHLEGMATIC personality are unassuming, agreeable and intuitive and they possess the ability of "Web thinking
I.e to see the relationship between many bits of data they get. They have distinct skills to get facts, group them into categories and then check the relationship between seemingly contradicting elements. These people cannot memorize seperate unrelated facts. In addition, they are imaginative, build intimate attachments with about everyone in their lives, they try to understand what others are feeling or thinking, they have talkative nature because they see connection and they may take criticisms as an insult and they are prone to depression.

CHOLERIC
They are associated with testosterone, choleric are mostly men. They are gifted businessmen. These people have deep concentration. They don't smile much and avoid eye contact.

MELANCHOLIC
They tend to be loyal to their family and friends and extremely careful. Melancholic personality traits are associated with SEROTONIN, which  suppresses aggressive tendencies. These people pay attention to details, they remember special date and remember details about colleagues or neighbors. Melancholic are orderly, they express themselves accurately. They are proud of their accomplishments, they are close-minded, dogmatic and stubborn.