It's a skill

Anyone can draw or paint.
Drawing and Painting is a skill, some people are born with it and some had to learn it. If you have the desire to learn this skill you can make great works of art. It takes long hours and a lot of studying and practicing to be good at it. How long exactly? I don't know...I guess it depends on how hard you work at it.
I'm still learning. I'm no expert artist but I strive to get better and better through practice, and study. I only have high school art classes under my belt, but reading art books and watching video tutorials has helped me improve. However watching video's and reading books only get you so far. Actually putting paint to canvas or pencil to paper is where your skills will improve. You don't have to start out doing a master piece, just start small doing little studies, that way if it doesn't turn out right it's ok because it was just a study.
So get out there and get your painting on! You can do it!