It's not even necessarily an issue of learning disabilities, but of how the OP might've been educated.
What REALLY needs to happen--what the true issue is--is this.
There is a difference between dreams and
S.M.A.R.T. goals: Specific, Measurable, Attainable, Realistic, Timely/Tangible. It is all well and good to have dreams, but in order to accomplish those dreams, they must be defined very tightly and all of the steps needed to accomplish that goal need to be planned out. All of the resources need to be in line to accomplish that goal--linguistic, financial, personal, and otherwise. Most goals CAN indeed be accomplished, but there has GOT to be a coherent plan, one that starts from the very beginning and acquires all of the building blocks necessary to reach for the prize.
When a person finds they do not have all of the resources, you have two options: take constructive steps to acquire those resources, or redefine your goal. If I were in the OP's shoes, I would take steps first to become financially independent and get into an environment more conducive to creativity and general well-being. At some point in the process, I would also suggest enrolling in some continuing education courses with a defined goal in mind--moving from the goal of increasing general proficiency with the written English language into, at some point, specific formatting required for scripts and screenplays, submission requirements, and personal marketing skills required (after all, in such a competitive environment, it tends to be necessary to get an agent). What order these steps are taken in depends on if the continuing education is necessary before or after the job that will provide sufficient financial independence to move out. Depending on what turns out to be necessary, this could end up requiring a LOT of patience. Or things might happen very quickly--there's simply no telling from afar.
But there has GOT to be a clear, step-by-step plan with achievable, measurable, and logical steps to get from Point A to Point B, or else nothing will happen. That's true of anyone. Dreams have to be converted to goals, in order to become reality.