Work relationships

Have you ever felt like your boss is picking on you? What did you do?

I guess I just need to know if I’m being dramatic or if I have a valid reason to be pissed.

Ok so I work in retail at a thrift store. All of the time we see things that we want to we keep them up front By our Registers. Even the the supervisors! Yesterday someone donated a smart watch and I was going to buy it for my boyfriend. The supervisor that always gives me trouble took the watch from my register area and then I couldn’t find it anywhere in the store. So today I was taking my 15 and I wanted to purchase something I found for my son and she refused to ring me up she said i have to be clocked out on my lunch to buy stuff. Which isnt true she’d just let one of my coworkers buy stuff on her paid 15 min break. And yet another thing she does.. we have a rule that we can’t use our 50 perfect off on things that have been in the store less than 48 hours. She doesnt let me break that rule but she lets herself and others. Does it sound like she’s picking on me or am I being sensitive. I’m literallt sitting in my car crying bc I hate working with her that much