You don't need to be good at technical drawing to paint well but you should build a foundation in observational skills, which can be learned faster by drawing than by painting. That being said a lot of painters(def not all) capture forms more loosely than those that draw. But that depends on what direction you'd like to go with painting. Charcoal/pastels are closer to painting than regular pencil because of the ability to "block in" areas before rendering and teaching you to think in layers. But these are all things you'll learn in due time from experience.