I suck at drawing but that's only really an issue when I'm in a really boring lecture and me and my friend will start drawing on our lecture notes to entertain ourselves.
I also suck at self motivation especially in regards to my training. I usually only ever stick to my training program for about 2-3 months at a time so I never really get as fit as I would like to be which sucks seeing as most of the guys I'm training with and competing against train for about 50 weeks of the year.
I also suck at getting a job.
Apart from that though, I'm generally pretty good at what I do.