How can I improve my coding skills?

Hey. I'm coding for about a year now and frankly speaking I'm really frustrated that I still can't do most of the things I wanna do. I'm 16, so when I'm 20 I want to be able to make a full on program for computers. What should I do to get to that skill level ASAP? I'm already very good at math, specifically geometry. Is there any thing I can do to improve faster instead of straight up just coding?