TLDR; started a new job, now doing two people's worth of work
I'm about a month into my first job working as an office assistant in a small company. Another woman got hired the same time as me and we were assigned the same tasks. When I first started, I did all my assignments effective and fairly quickly because I was excited that I am finally doing something with my life. (I regret working at a fast pace when I first started because now everyone expects so much from me. This is really a lesson learned for me).
Now a month later, I am realizing that I am taking on a lot more work than the woman that I was hired with. She only works part time and does the bare minimum when she's in the office. I often find myself doing more of our tasks since she slacks off. If the work doesn't get done, then I get in trouble since I am there full time.
I really don't mind doing the work myself especially since it's our slow season at work, but the fact that she just sits there on her phone and doesn't try to do anything while I'm doing the work makes me pissed off and our supervisor hasn't called her out on it. I have already hinted to her multiple times that we shouldn't slack off on our work because our boss has already gotten mad. I hinted to her today too that I need more help doing our tasks. I feel like it just goes over her head and she doesn't care.
Other coworkers come to me too for small favors because they know I won't say no which makes me so annoyed.
Advice? Please help, what should I do? I hate confrontation and I'm intimidated to talk to my supervisor/boss especially since we are a small company, I don't want it to seem like I'm starting a problem.
(I'm keeping this super short, but I could go on and on lol)