Why arent girls interested in me?

ok well im soo confused because im 15, nvr had a gf and have been turned down four times now, because the girl only though of me as a brother. Im six foot, hazel eys, blonde hair, and im farely strong i guess.... my max bench is 205 btw, but besides that im just really confused because girls arent even showing interest in me :( is it because girls my age want a bad boy??