There are many very good reasons to expect a lot of the life in the universe to resemble ours at least in its chemistry. That's because, perhaps aside from dark matter, we know what elements the observable universe is made of and we know the chemistry and physics of those elements pretty well. Of these elements, we know that carbon chemistry is the richest and most complex of any of them by several orders of magnitude. Also the temperature range in which that chemistry reaches its peak complexity is the temperature range of Earth.

This isn't anthropomorphism and it's hard to see any bias in play. This is simple extrapolation from the physics and chemistry of the universe we can observe within the some 14bn light years range visible to us.

Of course there may be many different possible realisations if that chemistry. There may be many possible alternative structures other than DNA for things like heredity and alternative building blocks to proteins and such, but if there are such alternatives they are orders of magnitude more likely to be based on carbon chemistry than anything else.

If you rank the elements in the observable universe in order if prevalence, other than Helium you get the same answer as if you rank the elements in order if prevalence in our bodies. We are made of the most common materials anywhere in the universe. In terms of composition there is nothing special about us at all.

Finally, it's hard to see how natural selection or evolution are special to the conditions on Earth. There no real reason to believe that these would not apply to any other form of life.

So it's absolutely important that we try to be objective and keep an open mind. There may be much about the universe we don't know. I've already mentioned dark matter. But from what we do know, there are good reasons to look for life in worlds somewhat like our own.