I feel like a different person

On the new years i was invited to a dorm party with a few of my mutual friends, whilst there i obviously drank, but being the first time i had drank i did not realize how much was too much. After waking up and vomiting for the course of the day my friend took me to burger king and explained to me what had happened the previous night. He told me that when i was at the party i drank too much and likely had alcohol poisoning. But what got me was that he said I almost died. I was not taken to the hospital but apparently i was so bad that i kept passing out and he was even checking my pulse, needless to say yes i could have died. After he dropped me back at my dorm i sat on my bed just thinking about how much i haven't accomplished, and how many dreams would never be reached, and how my death would affect so much. Its been a week since i sat down on my bed and had those thoughts, but i don't feel like i am myself anymore, my friends have noticed that i act a little off. I feel like i am a different person but at the same time i don't. Could me drinking too much somehow alter my personality? Please if anyone has been in this type of situation please tell me what is happening to me.