Attempting to learn Spanish: I never became compotent at the language even after three years of trying. I barely scraped out with a D and just a few short months later when I entered college I was tested and placed in Spanish 101. I didn't get any better.
Attempting to learn the piano: one year, once a week plus home practice and still my fingers could not get the notes right. At my final recital I played a horribly butchered version of my rather simple song (got nervous and went too fast for a more mid tempo song, finished the two and a half minutes of it in one minute fifty seconds) and currently I'd have to start all over again even after a year of training.
Writing: I write a lot in my spare time, and after TEN YEARS of near continuous writing I've still yet to produce a single piece of quality material. My sentences are still pockmarked with grammatical and spelling mistakes even after revision, my characters are still cliché and tonally schizophrenic messes, I blather on going into pointless detail that doesn't contribute to the overall work or is such a protracted talking heads sequence that the overall action takes a back seat for over a page. I still can't write proficiently after ten years of doing it as a primary hobby and it infuriates me perhaps more than any of my other grievances.
Weight lifting: I've been lifting weights for a year, and I have been stuck at the same weight limit for months, unable to lift any more in any exercise without risking injury. I'm still weak, and even after all this time I'm still equally as weak.
Games: Board, video, sport, even ones I've played for years on end I still get my *** handed to me on a silver platter. I can't do it, even when I put my all in I am still bested by people with inherent talent beyond mine, I can't win consistently.