Fact: A painting is not a colored-in drawing. (And a drawing isn't a painting that hasn't been colored-in yet.)
Painting involves its own set of skills. Even if you were an expert at drawing, you'd need to learn how to paint. Some artists like to do detailed drawings to use as reference before they paint, but many don't. Some artists do drawings directly onto their canvas before they start to paint, but many don't. There is no rule that says you must draw before you paint if you don't want to.
Drawing is not just an initial step in making a painting. Drawing is a different way of creating art. Having drawing skills will definitely help with your painting, but if you hate pencils and charcoal, this doesn't mean you can't learn to paint. Never let the belief that you "can't even draw a straight line" stop you from discovering the enjoyment that painting can bring.
"Painting embraces all the 10 functions of the eye; that is to say, darkness, light, body and color, shape and location, distance and closeness, motion and rest." -- Leonardo da Vinci.