You are saying it's not sci-fi? Sure, it's in the past, but science fiction doesn't have to be in the future...
Science fiction is a genre of speculative fiction, typically dealing with imaginative concepts such as futuristic science and technology, space travel, time travel, faster than light travel, parallel universes, and extraterrestrial life.
Star Wars has all of that and more.
I know. It has sci-fi elements.
But it is largely fantasy - first it's not based on anything known, whereas sf about future or past Earth (or any of its current inhabitants) is based on a real place and speculation of how known lifeforms might deal with theoretical ones.
Star Wars doesn't hold true to the laws of physics except where the plot calls for it - the same could be said of a lot of sci-fi too if the writing is lazy, but the point is that it takes place in a realm (universe or galaxy) where known science doesn't even need to be considered if the storytellers don't want it to (whereas, more reality-based sci-fi usually has stricter science to attempt to adhere to). Especially when any limitations of science can be instantly overcome or superseded by the supernatural.
It's largely a story about the supernatural - Jedis are basically warrior monks whose philosophy is based on a religion.
Sure, the argument could be made that the "supernatural" is just science we don't know about yet, but a more objective argument would be that the supernatural doesn't exist at all, but is a man-made concoction to explain that which we don't yet understand. But in the Star Wars universe the supernatural is a given and to be taken as fact as a plot element (thus more speculative religious / mythological fantasy than science).
Star Wars is basically Lord of the Rings with some spaceships and ray guns thrown in.