Open Question: please help radiography tech career help?

Hi I am attending a community college and this is my first semester their I wanted to become a doctor and wanted to complete a bilogy associates form my community college and then go to a four year college but i decided to switch my major and become a radiography tech the program i have heard everyone say takes two year but my advisor is saying it is going to take me four years because I am starting from scratch and dont have the background. I toke bio 113 this summer but the program is asking for bio 103 and 104 what should I do is their anyway to get around this. Does it really take this long. PLease PLEsea tell me what to do