No, we are not alone. Likely, there are many, if not infinitely many,
space faring beings, YET, we've not been visited by a single one.

Why ? Quite simply, Distance = Speed x Time , and distances are simply
far to great.

Speeds would have to be multiples of light speed for practical travel
between the stars, and this is clearly impossible.

And worm holes, a breach in the space-time continuum, are not
possible.