that's alright. try loosening your grip on the pencil ( or tablet pen ) and just fluidly moving it around to create the shapes of your drawing. don't focus too much on one area of your subject before getting the entire image down lightly and loosely. once you've visually put on paper basic shapes and composition of what you want, start refining the details.
One thing I think about is.. get into your characters head, and then stand in front of a mirror and try out some poses they might do.
If you're the shy kind (like myself) wait til no one is around. Then play pretend. And instead of thinking "ugh I look silly" Study your body for all the nuances. Like a shy character might hunch their shoulders and fold their arms, but a loud character would stand in a much more confident open way. A character artist is just an actor in paper after all.
Also study the body language of characters in films, (less animation as it's also a drawing) and watch how different character types act and react with body language.
Not every person when standing still holds their body the same, I know I have a tendency to lean more on one leg. Watch you family and friends when they're just standing too, what way do they stand? Or walk or move their hands when talking (or not).
This observation thing gets addictive, but it also really helps make characters more alive in simple ways. You don't need grand gestures to make an excellent drawing.
That's actually such a GREAT idea... I've never thought about posing how my characters would pose! You are awesome! I'm definitely going to try this out. I have long wardrobe mirrors in my bedroom, so I can see my whole body which would be great C: I should try all these things, thanks a lot for being so helpful