The Basic 737-800

[Leftcoaster]

I was crusing on 380000 feet if i recall right, and the plane was a bit nose heavy which means nose down during whole flight that is
why it registered the whole flight as decenting, but my clim right was 1800feet and decent are around 1000 feet,

Sorry, that makes no sense.

Cruising nose down means that you're either too fast, too low or both and FsP does not care what the aircraft attitude is unless it is doing
cabin service and in FsP it is calculated based on a negative change in altitude and not by in-flight attitude. M0.74 at FL380 is pretty slow
for a B737. The flight reports from FsP9 include maximum altitude, to bad your report omits that piece of data.

If the model was so "nose heavy" to force a negative pitch, climb would probably be impossible and with the centre of gravity so far out of
whack as to force the nose into a negative flight profile, it is unlikely that the aircraft would fly at all. FS does model CG effects and balance
issues fairly well and as in real life, planes generally cruise nose up or nose down because their pilots place them in flight regimes
where the wing is forced into a pitch that is less than ideal.

Too high and or too slow, the wing pitches up, fly too fast for the current altitude and weight and the wing pitches down.

The numbers on the report indicate <FL320 not FL380 at a rate of climb of 1800 FPM so there is still something in your narrative that does
not fit the data while the cruise attitude is irrelevant to the FsP flight profile.

Where you flying into a significant headwind?

-C