I know a lot of scifi gets flak over it about how a lot of aliens look like humans or are generally humanoid, but look at the diversity of life on Earth. there are millions of different species. At least hundreds of which could have evolved into sentient life, and even if they did not most of them occupy a niche in ecosystem that is quite high on a foodchain.
So if there is a planet out there that has similar conditions with similar basic chemistry as our planet, then why wouldnt it evolve in a similar way? sure the permutations are kinda endless but species like krogans and salarians while humanoid are different in a lot of aspects.
Also for a type of stellar or interstellar civilization that we can understand, so basically a technical civilization that relies on science and tools it requires the species that actually uses them to be similar to us, it requires a high enough intelligence to invent things and relatively high manual dexterity to actually put them together. It also requires for the species to have conflict with their nature and each other, a species that comes into balance with itself on their own planet within the timeframe enough to produce enogh population to fill the planet would stabilise itself, it would work with nature rather than conquer it. So it wouldnt need to research FTL.
And if its similar in those parts then similarities or at least parallels in culture are quite likely.
Plus, here is an idea. For those who have watched the latest Godzilla movie, Godzilla is intelligent in the movie but its different than our own, its an absolute alpha predator intelligence, powerful enough to count as a natural disaster, as an act of nature, it has no need for tools, its already strong enough, it has no need for philosophy or science, and since they can lie dormant for what seems to be decades at a time or even thousands of years, they would not require high reproduction rates, and since they are intelligent most of them would sleep preserving their status quo, such an intelligence could simply exist out there, top of their food chain, top of their ecosystem powerful enough to not feel threatened, intelligent enough to understand that. they would never need space travel, for all we know Jupiter might be a home to giant dragons, just floating for years without movement fed by planets radioactivity, by the volatile gases in the atmosphere. they could be intelligent but if there is no threat from the outside and no social pressure from within their society is static. How do you interact with someone if they have absolutely no need or interest to interact with you?
Which is why most alien species that we see in scifi is humanlike at least in some aspects, and probably why alien species that might exist will be similar to us, other species will exist but they are far,far less likely to ever need to interact with us.