Who am I?

I woke up from my coma four years after the accident not knowing anything not even my name.When I woke up a nurse ranned out of the room and screamed for help,then she came back with other doctors, who stood there in disbelief, and after awhile they started asking me questions but one of the questions made me think harder then ever."¿Who are you?",that one question had me questioning myself,"¿who am I?","¿What's my name?","¿Who was I before any of this?".Dr.Lee introduced himself to me and said that my grandparents were in their way,and that meanwhile I was going to have to answer some more questions.He said if I remembered anyone's name and I told him no,he then proceeded to ask if I what happened I told him yes and explained that I remembered running away from someone then getting hit by a car,after that he told me that the person I ranned away from was a friend of mine.Then I couldn't stop thinking, If it was a friend of mine then why was I running away from them?,¿What caused me to run away?,but even if I tried remembering nothing came back to me.After half an hour an old man and woman showed up in my room and Dr.Lee explained they we're my grandparents,he then told them I didn't seem to remember anyone or anything before the accident.They both stared at me with tears running down their faces, I felt bad but I couldn't do anything, then the doctor told them that they should try and tell me everything I needed to know,after that they told me my name and everything before and after the accidents and since they didn't have any clue about my memories in school they decided to give me my diary where they said I wrote everything down from each day since I was five.From there I learned about a girl named Melissa who disappeared after they took her from her Foster family,I also learned of my parents, and of Edgar and his family but even with all of that information I still had no clue how they looked like or the way their voice sounded like and even worse I didn't know where they were located at.