True sagittarius? december 21?

So my entire life, i thought i was a sagittarius but i recently read online that i am semi-capricon? or a cusp or whatever? after doing research on both personality profiles it appears that i am a true sagittarius. i am no where near introverted and reserved. i am the most restless and outspoken person i kow. i fit the sag.profile to a tee and love to explore! im just slightly confused about this, i dont know the exact hour of my birth but i guessed pretty close i think. anyway i did one of those birth charts and they say im a cap.sun....ewww. im sorry but that really is not me at all. i feel really disappointed, like maybe astrology isnt real. please dont answer this unless you do believe in astrology, because ive got better things to do then read "yo, this is sum dum sh*t. stars aint real,ya no" haha. please help me! i feel lost