As the title says.. I want to play a dark side character because I feel like i'm missing out on a lot of lore if I don't..
You don`t miss out on any lore (Bioware did not expect certain alignment choices for the course of the classes stories), so play however you like.
Also, more often than not, dark side choices actually hurt the empire's long term goals (making allies or friends often yields better results thank just killing everybody).
Therefore being light side comes rather easy for any imperial, who likes not simply being a dick (because that is what dark side choices often boil down to). A honorable, but uncompromising Sith which hates the Jedi/Republic and wants the Empire to win the war (and is not only in it for the joys of abusing others) will likely be neutral or light sided under this system, rather than darksided.