Growth.

I used to work for a clinic that was very catty. I had a narcissist nurse manager and coworkers who followed her willingly. It was my boss' first managerial role and she wasn't used to having an employee. Every day she would say, "well, you know I'm your boss, right?" or...," you better watch how you talk to me! I sign your paychecks!" The doctor was no better. I know I'm imperfect, but I put up with a lot of nonsense in that office. I stayed there for 4 years. Finally, I decided that I had enough and called the Director of my part time job to see if she had a full-time position available. She said yes, and immediately sent me the link for the position to apply. I went for an interview and I was hired. I told my boss who was completely floored once I handed her my notice. She immediately started asking, "was it me? are you leaving because of me? can I offer more money? did you want to train for a higher position?" I had been there 4 years, but she never wanted to train me in her role for a promotion elsewhere. I politely told her no. Since I was the only one in my position, I created a quick reference guide on how to solve the usual issues I would come across in my job and how to complete my usual tasks. The staff was grateful. My boss? Not so much. Fast forward a year and a half later, I still don't like what I do. My boss is fantastic. My coworkers, while petty, are generally alright. The workload is stressful due to high volume, but I feel like I'm wasting away at this desk when I could be training to become something greater than the position I fill now. I want to get into Human Resources. I took a couple HR courses when I was in college, but by the time it was offered as a Major, I was already in the 2nd half of my junior year. I don't know how to branch out into that field. I apply to HR Associate/Assistant positions, but because my work experience doesn't showcase that, I feel that I won't find a position where I can gain on the job experience. How can I make this change? Any suggestions? I'm just fed up and I don't want to be an employee working for a large organization and disgruntled because I "missed my chance" to become something more.