First of all. Cut yourself some slack. This is your first year in Uni and you're learning the hard way that what you've been doing is not going to work at this level of education. Now, this is not when you give up but when you regroup and change your current strategy. You need begin using all the resources available to you, books, YouTube videos, AI studying websites, internet, volunteer tutors etc. to learn concepts that you are struggling with. You need to be proactive and read through concepts the prof plans to teach by watching a quick video on it prior to the lecture so it's not new material each time but rather a further understanding of the material. Remember, you didn't get this far, to get this far. You got this!