WTF am i doing wrong?!

[Qambu Yaasi]

1) are the statistics trustworthy? or are they just like randomly generated?
Nope. They tell you something but nothing.
2) are the commentary trustworthy (normally they shoukld because if the reporter says goal there actually a goal has been scored)
A goal is only a goal when it flashes. There is a new commentary where it says Goal but it is not a goal because it just whizzed past the post. It happens so fast you may miss it.
3) how can u not score at least 1 of 9 shots on the target.
Yes you can not score from 9 on target.
4) do my players use their chances to score better if i change the formation (because normally if you have the same stats as the opponent and lose 0:4 in real soccer actually the formation isnt the fault)
That is your striker's problem or the defender is jst better at throwing their bodies in front of your shots. Conclusion, get a better keeper and striker (one that would be in the top 5 of the goalscoring charts)
5) do players need good and balanced stats in all categories to play good (my goalie and dc for example have only 3 stars but have excellent goalie/defending skills) so do i also have to train them in attacking?
Some 3 star players are good to play with but some are horrible and needs to be replaced. These are 3 star players who perform excellent against OOP teams and seriously weak teams but will not perform against teams that are of similar quality.
I use this as guide, X being the main attribute - X, X-2, X-6 (For GK & ST it is X, X-2, X-15)