I'm currently writing a sci-fi novel but am bogged down in notes constant subplot ideas and everything, from the start I had a clear end goal of the world building and character development and I definitely struggle with it. Reading back on my chapters I feel as if the characters reflect whatever mood I was in at the time of writing and don't stay consistent. Also dialogue is a struggle with the conversations either boring or giving away too much of the plot and I feel this is a sci-fi problem because I don't just wanna makeup random words.
So I guess my real question is how can I actually write sci-fi and the conversations pretending we are 1000 years in the future? I keep on having to write entire thousands of words worth of notes alone on just the world, cities, history and ideology that shapes the whole reason why the system of government is plausible.
Also I hate writing space scenes idk ahhhhhhhhhhhh.