Sag but don't act like a sag

Im a sag born 12/7 but do not act like a sag, I have a ton of fire sign friends and have a ton of sags in my life, but I'm much more serious, its very weird and although relationships scare me, it's not the commitment that scares me but having to be open and emotional, i tend to attract a ton of cappys and am in a relatioship with a cappy, but get upset that he can be so aloof but I am the same way, are there any other sags out there like this? my birth chart is

Rising Sign is in 26 Degrees Capricorn
Sun is in 15 Degrees Sagittarius.
Moon is in 15 Degrees Virgo.
Mercury is in 25 Degrees Sagittarius.
Venus is in 23 Degrees Sagittarius.
Mars is in 27 Degrees Capricorn.
Jupiter is in 26 Degrees Scorpio.
Saturn is in 00 Degrees Scorpio.
Uranus is in 05 Degrees Sagittarius.
Neptune is in 26 Degrees Sagittarius.
Pluto is in 28 Degrees Libra.
N. Node is in 04 Degrees Cancer

Thats how I am, I was just puzzeled becuase my siste is a sag 11/30 my best friends are sags 12/2 12/6 and 12/10 and I am so much more reserved, not the jealous type at all but both the sags on 11/30 and 12/2 are, and i was taken back at how focused I am with my career and none of my sags friends are that are very whatever, but at the same time i'm clumsy, witty, forgetful,creative and unprejudiced. It's so odd