What would happen if I stay outside for 2 and a half hours for 5 days a week?

I have a new job and the only way that I could arrive to work on time is to stay over night in a train station (okay not over night but for 2 and a half hours for 5 mornings only and just for 3 months till i buy me a car. My girlfriend tells me that I could get hypno... something and that I could die. I told her that in the station that I would be in, I have a wall (yes its open but its only 2 and a half hours) i have a wall on my right side a wall on my backside (these walls are made of cement a ceiling or roof and obviously I am on standing on cement not gr or dirt. I will also be wearing a coat two scarfs, a hat that covers my ears. I will wear 2 coats if necessary , I'll take with me a blanket and I will be taking a candle if i need it and be wearing layers of clothing. Plus I am over weight by 75 pounds. Once I get into work (its in a kitchen) so i get coffee immediately and put on the oven and etc so I warm up pretty soon. My girlfriend says that i will freeze because February and March are the coldest months of the entire year. What do you guys think. Its only 2 and a half hours and for only 5 mornings. my age is 26 yrs old.