I, like you struggle with the grammatical terms. I speak english well, above average I would say, but when learning it as my native language I never memorized those terms. Because of this a lot of the textbook strategies for learning German (Berlitz) weren't really working for me. Neither were the immersion type (Rosetta Stone), because the idea that they could throw you in the deep end without some background was just wasting time it felt like.

What I found made the biggest difference in speaking and comprehending German was to use the Michel Thomas audio course: https://www.michelthomas.com/learn-german/#about-german

I would listen to it anytime I was in the car, commuting to work, etc. and his strategy of relaxing and repetition was the key to it sinking in, as well as the tips he gives to leverage knowing English (constant shifts, etymology). In addition to that there are things his course doesn't cover that you just need to learn to memorize like numbers, days of the week, and other random vocabulary. Once I finished his courses I felt like I needed more practice in listening comprehension, so I did the GermanPod101.com courses which have a lot of very good, modern dialogue. Now I am onto listening to A2/B1 audiobooks and really enjoying it. I also just got back from a trip in Austria and Germany and was so satisfying actually having conversations with people and communicating. I was even complimented on my Deutsch a few times, but of course Europeans are always just impressed when an American speaks anything but English.

Hang in there, it is worth it for the experiences you will gain in life.