I’m pretentious with my writing, and I need to change it

When I was fourteen, the Google search bar was my constant companion whenever I wrote because I wanted to show off, and realized how I pretentious I was, and I just realized how I still retained that pretentiousness. Though I’ve alleviated my usage of synonyms, and opted for ‘simple’ words, I still haven’t changed, it seems. Basically, my definition of good writing is complex sentences that use simple words with a hint of a ‘fancy’ word right here, and there, and I’m believing I’m not a good writer, and reader if this is what I believe. Does that make sense?