Paraphrasing and using your voice while writing takes practice to get good at it. The more you do it, the faster you get better at it.
Your brain takes in information, processes it, understands it, and applies it to other things. It then becomes your knowledge that is based on the author’s information. When you use that knowledge in your assignments, you should use your voice (your own words and phrasing) because it’s coming from your brain, but the original information is still from the author, so you need to cite it.
Part of academic writing is adding your thoughts, ideas, interpretations, and analysis to the conversation. Because you will have researched your topic to have some expertise, you should have also developed your study of the topic being discussed.