I wish I could draw. There isn't a day that goes by where I sit at my computer typing, and think "you know, this story would go very well in a graphic novel!" and then I remember I can't draw at all, and get a little sad ._. Luckily, I do have a girlfriend who can draw (even if I don't always like the style), and she's actually the person who drew my profile picture, and my youtube banner.
As for a talent I already do have, I believe I just mentioned it. My main talent is writing. It's something discovered in 2nd grade where I wrote my first 100 page novel and read it to my class. Ever since (up until high school where no one gave a shit who I was or if I even existed) I was known as that "kid who wrote books" since no one else in my school seemed to have the drive or patience to do so.