You should try sketching with a reference in front of you. I think in general drawing what you can see is a skill that most people can easily learn (and should), while drawing what you cant see is something that requires diligence and practice. Right now, drawing with a reference will help you...
when I was in middle school, I got a "How to draw Nintendo characters" book and it actually really helped with learning to draw. It takes you step by step through a process to draw characters, and the principles it teaches extend to art in general. I would definitely recommend checking out an...