I Just took a flight from Orlando Intl to Frankfurt Germany which is a 8 hour flight. I was flying a Boeing 747-400 and I had to refuel before I reached my destination.

I have flown on Delta airlines in a Boeing 747-400 from Columbia SC {CAE} to Atlanta Intl then to Frankfurt Intl
and we never had to refuel.

So why is that when I am flying the same jet on the game and I have to refuel before I reach my Destination.

If you use the flight planner it will give you a idea of how much fuel is needed. But be aware this does not include taxi and runing of the apu while at the gate. I have also noticed that if one tank gets low it will tell you that you need to refuel press ctrl x to transfer fuel. Perhaps this is what is going on 8)

Also factors in the fuel scenario are things like holding patterns, the route taken, and weather.  If you're flying into a 500 knot headwind, for extreme example, you're going to need a bit more gas.

Were your tanks full when you pushed back?  And if so, how long was your taxi time?

Like what codered said, it's best not to have the throttle open all the way open throughout the flight. Taking off tends to eat up most of your fuel so after I level out I usually turn the #1 and #4 engines off (only on the really long flights ). You do lose some airspeed but if the weather conditions are good you won't lose to much...

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Everyone keeps saying "APU" what is the "APU"

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Auxiliary Power Unit.
It's a small jet engine, often located on the rear of the fuselage. It provides air condition, electricity (AC), bleed air for engines during start-up etc. The Boeing 747 of course has one

It's a very essential piece of hardware, and often makes a loud hissing sound when the aircraft is parked at the gate. Then, when the engines are up and  running, the APU is shutdown and you select one of the engine generators as the AC source

It's definetely NOT the APU, since it's not modelled in the stock aircrafts, and also it's smaller than the other engines and won't use THAT much of fuel either.

Donnu what's the deal here.... =/

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I mostly fly low altitudes such as 10000 FT because the higher altitude flown makes more presure on the aircraft which causes the aircraft to fly slower at full throtle therfore sence the aircraft is still at full throtle but it flies at a slower airspeed because of the high altitude presure that means that the engines have to work harder.

So I do not understand how  flying at higher altitudes could save on fuel consumpion because The engines are working harder...........

The engines are not doing any more work at FL400 than at 10,000 for the same IAS. 
The IAS at 10k results in a TAS not much greater than IAS.  At FL400 the IAS TAS difference is much greater.  At FL300 the GARMIN GS was 514 kts at .84M while the IAS was 340 kts.  The difference GS to TAS is wind.  Assume for illustration no wind.  While atmospheric pressure is much less at altitude than at 10k, the OAT is far less also.  Standard temp at 10k 23.3 degrees F; at FL400 it is -67 degrees.  The jet operates on fuel added to increase temp for a thrust reaction.  Low temperature slows the speed of sound and at FL400 can result in drag due to transonic shock waves.  Thats why the wings are swept and great attention given to faring of the wing, tail, and fuselage.  For real, the 747 would not carry a full fuel load for the Orlando/Frankfurt run.  Costs $ to transport fuel not required for flight plus a reserve.  Cargo  produces revenue.