Its your first playthrough. I would wager you didnt encounter half of the side quests nor had the time to choose different outcomes in each to then determine that it made no difference. Only after playing the game a number of times did I notice the alternate outcomes. There are many. For the main storyline, sure there are only a few things that are different depending on your choice, with the ending being multi pronged fork, but when you compare it to other RPGs like Skyrim etc your choices arent really meaningful when you clear the same almost identical cave, kill/save the same set of people and the guild you chose to be your profession determines your play style. Would you say Skyrim isnt an RPG?