No one can make you fast.. it is a fard, ultimately between you and Allah, for your own sake..
fast isn't easy but it is a reminder to us that there are folks living like this all year round, if you see some of the Ramadan the big picture posted by Abu sayyed, you'll see children not even of legal age for this to be mandatory who are fasting, simply because they can't afford to eat, then stand all day in the heat waiting for ma'edat ar'ra7man for someone to give them charity food.. while even they consider themselves lucky as others search through the garbage for food..
The spirit of Ramadan is for many reasons, physical/ psychological/emotional -- but ultimately so you can feel one with the part of humanity that lives below poverty level.
I have had the flu for three days, and get less than three to five hour sleep on any regular day, and it is indeed hard.. but it is such a blessing on many level.. it is exactly what the body and the mind needs.. and I feel really grateful that Allah swt has allowed me to get through the day, with my own will and always find stuff to eat.. I can't help but look at these children and think, even through this, it doesn't get any more desolate than this, they manage to smile.. sob7an Allah
You can let your weakness and desires dictate to you, whether or not you should fast.. food is just one fridge away, one kitchen away, one munching non-muslim friend away... but will power is yours and you are in control of your body, your mind, your path to Allah swt...
and Allah knows best