What am i doing wrong...?

[CH_RoadDogg]

You need to throttle up easy get the plane rolling once your rolling pretty goog ease the throttle up gradually picking up speed.

Going full throttle from the get go is giving the plane to much tourqe and going to pull to one side.

[TUCKIE_JG52]

Do you have crosswind from the right?

I've noticed serious control problems (realistic) when taxiing any taildragger (all planes) of the simulator when there's strong crosswind.

The plane tends to face against the wind.

[JG53Frankyboy]

in general i would say, lets wait for a patch !
i have one starttraining mission, and only the Blenheim behaves so weird - so, it cant be 'only' the wind in the mission.

anyway, check your rudertrim before start. in older versions the default trimm was set to right ! how it is now, i cant remember.
but even that doesnt help much.