Are we alone?
No, but we're getting lonlier. The universe is probably about 15 billion years old but it has expanded perhaps 96 billion light years and its hard to say what is beyond the visible horizon. This concept is complicated further by saying the big bang happened everywhere when created space time was small. So for the last 10 billion years conscious life has had time to evolve in special places. The time to visit each other ould have happened when we all lived closer to one another in a smaller universe. The odds of a visit strikes me as becoming less likely with each passing day. There could be nearby neighbors or species that have no home to go back to, or reach if they tried.
Scientists say that the universe is not intuitive to our minds. Thats one way to look at it considering the truths of quantum mechqnics but lets look at the similarities. I say we are a universe in ourselves that is born from something very small. When we were eggs we were .2 millimeters at most, just barely visible to an adult. The universe was tiny too. We will die, so will the universe in a thinned out big chill.
We are not one individual but are actually many lifeforms in that half our body weight is countless millions of bacteria. The universe is also a conglomeration of countless stuff. We get bigger, so does the universe etc etc etc.

We are made from the universe and obviously share some of the big things that the universe also experiences as Rap recently mentioned, everybody poops.

Will we get along with aliens? Probably no better than we get along with people on line.