What are my chances to go into physics?

[med17k]

Hi , I'm a 4th year medical student but I don't want to do medicine anymore , actually I want to do electrical engineering or theoretical physics in the United States .I'm 20 years old now and not a USA citizen . what are my chances? Can an american university accept some one like me?
I also do not have american high school diploma

 

[Mépris]

I have nothing else to contribute to this thread except for this tiny 'wow'. So, 'wow'. (uni at sixteen?!)

 

[med17k]

I have nothing else to contribute to this thread except for this tiny 'wow'. So, 'wow'. (uni at sixteen?!)

At seventeen .