How do I know which constellation I am?

According to the Gregorian calendar birthday:

Birthday constellation

3.2 1-4.20 Aries

4.2 1-5.20 Taurus

5.2 1-6.2 1 Gemini

6.22-7.22 Cancer

7.23-8.22 Leo

8.23-9.22 Virgo

9.23- 10.22 Libra

10.23-11.21Scorpio

11.22-12.20 Sagittarius

12.21-1.19 Capricorn

1.20-2. 18 Aquarius

2. 19-3.20 Pisces

I suggest you go to the library and read more books. ...