Corporate culture is weird and frustrating

I'm rly happy with my new job, as it doesn't entail phone conversations with irate Southerners who make death threats bc their refrigerators aren't producing ice.  Ppl here are rly nice, there's a petty cash fund that always covers lunch for employees, etc

The thing is, the capacity I was hired in was "paid PR intern", n when I started the job, it was with the understanding that I'd be doing a lot of grant writing, copywriting, PR, etc.  I'd mentioned that I had some experience, professional and not, with graphic design, but that was just one of the many things I mentioned in the interview.  N all I'm doing now is graphic design, which I'm way underqualified for.  I have no training, I really don't do much of it in my free time so it's not even a hobby, I probably harness less than 4% of the power of the programs I use when I use them.  Basically all I'm good for are one-off posters and wedding invitations etc, which is a useful skill to have but not rly impressive bc most of my high school friends can do the same.

It just really sucks, though, bc they assign projects to me, and obviously I do my best, but the outcome is never up to par with what they're expecting.  Because really, they do have a team of college-educated graphic designers -- they're just not used all the time, because they're really overworked.  So the these projects I'm given turn out less than ideal, and my supervisors and their supervisors take them away from me and give them to the people who should have been doing them in the first place.  And their opinion of my competency is tarnished.

Meanwhile, my friend in Finance pops by my desk all the time for help with copywriting, which is what I'm good at and wish I were doing more of, and they're not going to give me credit for that, you know?  Which is fine.  I like helping people.  People at my office help me out, too.  I just wish I'd get those assignments, which I could excel at.

I'm really good at writing.  I know I can be valuable doing that.  I know I'm not valuable at all in the capacity of a graphic designer -- which is weird, being this incompetent.  I am really not used to being this totally incompetent at something.  Not because I'm GR8 @ EVRTHNG but because usually I'm able to work in areas that I have some skill in.  Idk

I guess what I'm trying to say is: I just got back from being told my work was unusable and it hurt my feelings, boo hoo