Is AUTHOR wrong in the post ? POST : AITA for not suggesting to pay rent?

So for the past couple of months I've been living with my aunt rent free. I stayed there through the last semester of school and a couple of months of unemployment. I recently found a well paying job and I am looking forward to saving money so I can one day buy my own apartment. 

My aunt is by no means well off, she has a low paying job but manages to live comfortably. She is extremely frugal and good with her money, and do to financial finesse and getting lucky with the market she owns a great apartment almost debt free. 

When I got my new job I realized I was being paid a considerable amount more than my aunt. This made me extremely guilty about not paying rent. It would be great to be able to stay there rent free for some time so I can save up for an apartment... but still, it feels kinda assholey.

However, my aunt has never asked me to pay rent, never implied that I should or that she'd like me to. Most likely she'll never ask me.

Am I the asshole for not taking the inicitive and asking her if she'd want me to pay rent?