How should I handle this situation with my sister? (long but please hear me out!)?

It seems like shes doing a lot for you, and you just have to make it clear to her that you appreciate it. But you can't be lazy, in order to get a job these days, you have to make it a JOB, so be up early, and work all day on finding one. Not just laying around. Maybe once you speak to her and she sees your actually working hard, shell appreciate you more. You do have to remember its her house, her money ect... even though shes your sister she doesnt own anything to you, so stop being a brat.