Having a difficult time

Hey! I really need to vent/advice. It's my 3rd year of college. I am the hardest working student ever I will be graduating a year early since I took tons of classes. My freshman year away at college was hard I know I didn't study as much as I should have but I tried and it was very hard. So I went to community college and worked super hard! No grades below b. Well I am now at a new college and struggling so much. Idk why I attend tutoring, study on my own, and honestly can't say I wish I studied more since that's all I do! It's not like I don't understand the material either I can explain everything perfectly and have no questions. I had all my tests last week, my easiest class is online and I got a 64 on the first exam! I have no idea how since so far I have gotten A's and the exam was 4 essay questions that I fully answered! I'm meeting with him tomorrow but honestly guys I'm struggling so much and ready to give up on myself. I'm crying writing this because I just got an interview for my top medical school but if I'm struggling now then clearly I can't go to medical school. I'm so upset and honestly just want to be done with everything. I have such a good life but school makes me so unhappy since I study so much and do everything right and it never pays off. I believe that everything will work out but when life gets good- I get an interview to my dream school, everything falls apart. I'm trying to believe that it's all meant to be but it's really hard. I'm so disappointed in my self since all my friends have fun/go out on weekends and have good grades and all I do is struggle. It's not like I'm not trying and I personally reached out to tutors to help me! What more can I do?