I'm failing med school. How can I be a great student again?

(English is not my first language, I'm sorry if I made some mistakes)

I've always been someone who loves to learn and school was easy for me, although deep down I never felt smart enough, like I was fooling everyone. Nowadays, I lack discipline and motivation in medical school, I barely pass my exams and I just don't feel smart enough and it's like my grades are the proof. If a topic becomes difficult for me, I just run away and avoid it, so obviously I don't pass the exam. My classmates are brilliant and very supportive, but I can't accept their help because I feel like they think I'm stupid or weak . So the cycle continues over and over again .