Why does everyone have a constellation?

Because the constellation is calculated according to the date of birth.

So everyone has their own constellation, as follows:

Aries (03/2 1-04/ 19)

Taurus (04/20-05/20)

Gemini

Cancer (22 June 2006-22 July 2007)

Leo (07/23-08/22)

Virgo (08/23-09/22)

Libra (09/23- 10/23)

Scorpio (10/24-11/22)

Sagittarius (11/23-12/21)

Capricorn (12/22-0119)

Water bottle: 0 1/20-02/ 18

Pisces (02/ 19-03/20)