From a young age I was into Special Effects and Models for movies, had quiet a good book collection too.
Than one day I went with a friend to the local Hobby Show and there were all those Star Wars, Battlestar Galactica, Perry Rhodan, etc Kits.
That got me into SF modelling, scratchbuilding started when kits were missing pieces(frequent in those days) or I had damaged some.
Not that much into starships, but prefer robots, smaller vehicles and generall Sci-fi scenery.
FYI, I don't consider Star Wars as Sci-Fi, great movie but a looong way from true Sci-Fi.
Same as many other movies "wrongly" classed in that category.