How did you get good at development? At some level, you practiced by copying patterns and implementing them, learning along the way. The same principle is true for design.

I have a friend who I've seen progress from nothing to becoming a great web designer simply by putting in the hours. My best advice for anybody for whom design doesn't come easy is to take in inspiration (try behance or dribbble) and copy it. Keep copying until you make something worthy of being copied.