It's a question no one can answer for you, but I can give you an overview so you can try to understand things for yourself, and forget about scientists and mathematical formulas for calculating things, just look:
It's the constellation Orion, also commonly referred to as "the Three Marys" for the three stars in the center. On a clear night in a location far from light pollution, you might be able to see something like this with your own eyes.
Look closely at the image; each tiny dot you see represents a star, but these stars are all in the Milky Way, the galaxy where we live. Stars from other galaxies cannot be seen with the naked eye or with special telescopes; they are too far away.
This is a representation of what the Milky Way would look like in another, very distant galaxy. Individual stars are not visible in the image, but rather an accumulation of them. There are approximately 300 billion, 300,000,000,000 stars in our galaxy, which is a small galaxy.
To think that out of those 300,000,000,000 stars, only one has a habitable planet where life exists, and that it's the only planet with life in the universe... but what is the universe?
Beyond the Milky Way, you have thousands of galaxies that are more or less close and moving; this is the Local Group, our small cluster, and then there are the superclusters.
The image shows a "diameter" of about 10 million light-years and a reduced representation of the galaxies that are out there, not counting "everything" that is in the middle of these galaxies because although it is generally "empty," there are always things, at least dust and gas in some parts.
These clusters and superclusters group together and form things like in this representation.
Where it says Virgo Cluster, we are, more or less at that light blue dot in the middle of the violets.
Centuries ago, people thought that the center of the universe was the Earth, the Sun, and humans, and God, now thinks, look how big "all we can see" is and has decided if we are alone (as it is very, very big for us to be the only ones).