You need to study, study, study! What kind of artwork are you going for? It seems to me that you like drawing characters and creatures and that sort of stuff. If my hunch is correct then you need to studying human and animal anatomy. You also need to be studying from life, and you also need to study all the ways that complex forms can be broken down into simple ones.
Also, try working in different mediums and not just pencil. Pencil is great, I use it all the time but working in charcoal or conte, for instance, from time to time will really help your draftsman and rendering skills. If you want to force yourself to get better with line work, draw with a pen or even use ink.
Best of luck to you...and don't those dreams just be dreams!