ok this image is taken by HST using deep field lensing, this is actually a piece of space about the size of a dime and there are hundreds of thousands maybe even millions of galaxies just in this little section. Within each one of these galaxies is billions upon billions of stars. So I highly doubt we are the only life forms in the entire Universe.
As far as intelligent life you can actually try and calculate it using the drake equation and come up with a theoretical percentage of how many species of intelligent life on other planets.
The Drake equation states that:
N = R* × fp × ne × fl × fi × fc × L, where:
N is the number of civilizations in our galaxy, with which we might hope to be able to communicate;
R* is the rate of star formation in our galaxy
fp is the fraction of those stars that have planets
ne is the average number of planets that can potentially support life per star that has planets
fl is the fraction of the above that actually go on to develop life at some point
fi is the fraction of the above that actually go on to develop intelligent life
fc is the fraction of civilizations that develop a technology that releases detectable signs of their existence into space
L is the length of time such civilizations release detectable signals into space.
N Fp ne Fl Fi Fc L
400billion X ¼ X 2 X ½ X 1/10 X 1/10 X 1/100 millionth = N ~ 10 civilized planets
this is all theoretical not fact