You can definitely work on your shooting. I don't mean those instinctual ones where you stick you're foot out. Case in point:
1. Fat Frank when he first joined Chelsea had an alright shot. His hard work made it into a lethal weapon where you knew him from 25 yards was a decent opportunity
2. Suarez was pants finishing wise in his first season, got better but still pretty poor in his 2nd season, was absolutely deadly in his 3rd season. Turned into a finisher or just lack of confidence?
3. Messi when he first started out wasn't great at scoring chances. Now he scores for fun.
4. I always thought Wayne Rooney would score the spectacular goals but miss the relatively easy ones. He's much better at finishing his chances off now than he used to be.