I feel as if there isn’t enough space inside of me to take in all this knowledge/information that I’m going to need, lol.
I used to feel the same in regards to studying and taking in information. In essence, what I realised is that the capacity for the body to learn is pretty much 'infinite' - meaning there is almost no limit to what you can process as information as regards the total volume. That does not mean you don't have to pace yourself and develop an effective studying method. Studying is a one step at a time process.
What you could start with is to speak/write self-forgiveness concerning your beliefs about the limitations you think you have in regards to retaining information.
One advice (from Bernard) that has always assisted me is that once you really grasp the meaning of the words you are reading and the relationship between the words in the sentence, then you will understand and with that the understanding will remain. This means that you place your focus on the understanding and grasping of the information, rather than on 'memorising words' for instance.