What to do?

I don't know what I'm doing with my life. I am currently studying at grade 12 in Nepal. I thought that I would study hard from 11 class but my while 11 class got wasted due to homeworks practicals and laziness. Then I passed the class 11 and I thought I would study from class 12 onwards. 3 months have already passed but I don't know what I'm doing I don't know anything,due to this I feel like I'm too late to study. Whenever I sit to study , I hear the things like you're late late . The dream of you becoming the doctor is over. I am not able to concentrate and focus. Deeply I'm dying of fear and anxiety. Whenever I see the questions, My brains automatically feel that i cant do it and I end up skipping it. Just 7-8 months are left for my medical entrance examination and I have to finish whole class 11 and 12. Right now I am scoring 40/200 . I need to score at least 150 to get scholarship but how to begin I don't know. This anxiety and fear is killing me from inside . I skip lunch and i barely eat dinner . My whole heath is getting down. My whole relatives and my parents has high faith in me but I'm scared that I wont fullfill their desires. Though persuing mbbs is my choise but I don't know. I hate biology.