OP, absolutely not. You are fine.
What nobody tells you is that around sophmore year of college, the educational system starts to fall apart. Up until now, you've been able to master all of the concepts you've been taught in grade school,high school, and intro courses freshman year. You could wrap your mind around everything in the syallbus. From here on out, everything starts to become specialized. The days of learning all in the same day about basic math, then basic composition, then basic spanish, then whatever, are over. You will no longer be taught by professional teachers, but by people who have made the subject they are lecturing you on their life's work. There is no possible way you can know it all in a semester. You can only get a glimpse of what they do unless you also choose to make it your life. You will drive yourself crazy if you try to master everything in the book. From now on, no matter how much you study you'll walk into tests knowing that there is stuff you might be asked that you don't have the slightest clue about.
Your liberal arts education is over, but you've got another 2 more years of being stuck in a liberal educational system being taught specialized material semester by semester. You will not remember any of the stuff unless you choose to make that your career. You just do the best you can and get through it.
When you get your first job, it doesn't get any better. It will take years, decades even to really understand the stuff you'll be taught in your upper level courses. I remember taking linear algebra freshman year of college 11 years ago. I still understand it. No big deal - I could wrap my head around it. But by my senior year of college, I was taking an ultraspecialized math class - should be easier right? I couldn't even understand the symbols they were using and to this day can't even begin to explain what the class was about -- something involving irrational numbers and calculus. It was a foreign language. I walked into the exams knowing literally nothing and still made an A. It's not like I was working any less hard. How did we go from teachable material to totally of the wall stuff in only 3 years?
Enjoy what's left of this year. From here on out, you have to pick something and struggle to master it. If you try to get a broad education in everything, you'll end up frustrated because everything in our world is so advanced now, things take years, not 3 months to understand, and either never remember any of it, or else think you know something about something which you really haven't the slightest clue.
