If you feel that strongly, for such an extended period of time you should change it. You are who you feel you are. If you feel a strong bond to the Kilpatrick blood in your veins, go for it!

Just be prepared to do a lot of paperwork to change it, my wife hypenated her our surnames when we married last Sept, she finally finished the paperwork two weeks ago. Were in Canada though, so maybe the process is different down there!

Slainte
Veritas Vincit