The question is always asked why we haven't been visited if there is intelligent life elsewhere, but we also view aliens as humanlike and have evolved like humans have on Earth. For all we know there could be a planets of alien doglike creatures unable to evolve and advance as we have.
I find it unrealistic to think that Earth has the only life. Everyone I have met that does not believe in aliens says the existence or discovery of aliens would mean God was not real. But I also find religion and the belief in God unrealistic so
It actually really bums me out I will likely not live long enough to find out. I it's likely I'll see people on Mars and possibly further out, but I'll be long dead before we leave this solar system.