How much do people think I really know

How do people think that you know everything? Every Day I have people come at me at work like I know everything. It's funny that people been doing their jobs for years and still don't understand what they are doing but expect me to know theirs. To me this just don't make sense to me why would I know someone’s job that I haven't been trained for. Yes, the questions that they do ask I do know or understand how to answer it. Then again how many times you must show someone how to do the job after they take notes and write them down and they still asked you the same damn questions. This has been going on for years for me as being the person everyone comes to. When do I get a break and ask other people questions for once? I would just like to finish my late couple of years of working and take it easy without all the questions from others. If they were in college or school, they would have to research information that they need to complete the tasks at hand.