Im 25 is it too late to start from the beginning and go to school to be a doctor?

No! I am 29 and in nursing school. I didnt even start my prereqs for nursing school till i was 25. Going to med school is a long and difficult road, but as long as you make the commitment and effort, youll be fine. I have several friends that attended U of AZ's med school in their 30's and 40's. Good luck! :)