Hi Eeda,
I believe David is correct.
It is a very common mistake with Skywatcher DOB (first time) users.
It comes with an adapter for 2" eyepieces and standard 1.25" eyepieces.
(Unfortunately on newer models) the 1.25 adapter fits into the 2" adapter and looks like it belongs that way.
It does not, only use one at a time.
Remove the 2" adapter (as the supplied eyepieces are normally only 1.25).
Using both together moves the focus point beyond the range of the focuser.
You have chosen a great telescope and it should give you amazing views.
Another hint, always start with the lower magnification eyepiece( the one with the larger number in mm on it) - (probably 20mm or 25mm).
Then move up to the higher magnification (probably a 10 or 12 mm).
Note that this will require a little focus adjustment.
Enjoy, and keep asking questions.