I was born on1September, 993 13. What constellation am I? I always thought I was a Virgo.

Because the constellation is calculated according to the solar calendar, so

1990 September 13 (lunar calendar) is the Gregorian calendar 10 October 30th, and you are Scorpio (10.23-11.21).

Scorpio character strengths:

Foresight, clear grievances, keen intuition, implementation of decisions, not afraid of setbacks, perseverance, loyalty to friends, natural sexy charm, persistent pursuit of the truth, good at keeping secrets, potential enthusiasm for life, strategy, understanding the key points of things, emotional sensitivity, delicate feelings, rich imagination, determination, down-to-earth enthusiasm, strong subjective opinions and firm will.

Scorpio personality shortcomings:

Too strong, jealous, suspicious, unreasonable, emotional, knowingly, duplicity, too strong love and hate, impulsive, aggressive, irritable, stubborn, suspicious, fickle, emotional, adventurous, and often have arrogant dreams.