How possibly can the population of earth have anything to do with increasing YOUR chances of being killed by an asteroid – it certainly will reduce the chances of you dying of old age, cancer, auto accident, etc. But your chances of dying of starvation, communicable disease, infection, exposure, and probably being eaten by a bear become much greater. Your expected lifespan will probably be much less. But it would have no impact on the size of the earth, its gravitational field, the number of meteors (or asteroids) striking the earth, and certainly your proximity to such impacts.
So no, if anything, it would reduce your chances of dying from such an impact because of your shortened lifespan.