Here's the situation..... This coming summer I'll be working at this company part-time for 2 years. Initially, there are 3 of us in our department. One ended up leaving a year later, and the other was let go. Since I work part-time with varying schedules, I never really needed to talk to the supervisor for tasks. I come in and ask my co-workers what's going on and what tasks must be completed.

  
Well since they are both gone, I wasn't properly trained and pretty much figured out how to do the job as I go day-by-day, considering I only work a handful of hours a week/day. I approached the supervisor once with a question and he said he'll teach me how to solve the issue once he's done with something. He never did. And this was like several months ago. Apparently, there's more work that needs to be done as my job description but he NEVER comes up to me or bothers training me. 

I figured he doesn't hate me or my job performance because if he did, I would have been fired. When I run into him in the hallway, he's polite and respectful. However, he's not really vocal about what things must be done, nor has he hired anyone else to help me within my department. It's not a difficult job, despite me picking up a few more responsibilities but considering I work less than 15 hours a week at most, I do believe someone should be there who can commit to more hours to be able to handle customer inquiries, etc. in a timely manner.

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I basically feel like I'm doing whatever I want at my job at my own pace without supervision. I've been alone in my department now for 9 months and he has not approached me at all. AITA for letting this go on for so long? Is it my job to come up/confront him about the situation? I don't want to make him feel nervous/awkward, even though I am nice and make myself approachable. 

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tl;dr - Boss doesn't talk to me because he's nervous/awkward around me.

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