Here in our Galaxy is more then 200 bilion planets, and many, many of them have similar conditions like our Earth. Also in space is so freaking big amount of galaxies like this one where we are living, that it's almost impossible for us to be only living and itelligent creatures out there.
There's very interesting Fermi paradox with similar theme like this thread has, saying that when there are so big chances of life in the universe why we haven't found any yet.
And if wondering why haven't we still get into contact with anyone, look how far has our signal traveled across Galaxy since first broadcast.
So if there's in Galaxy some intelligent life except ours, signal we've sent most likely haven't time to travel to them yet, and it seems to take some long time to signal to travel throught at least 1/1 000 000 of our Galaxy.
At the end i would just say have a nice day whether aliens are somewhere or not!