If it doesn't want to go into 1st or 2nd going - up or down - regardless of whether you're moving or stationary and the number of time you've double declutched or attempted to manually rev-match, BUT drops straight in if you hold it against the resistance and then switch the engine off - your clutch is probably dragging (AKA not fully disengaging).
Obviously if you've fitted a clutch stop that prevents you from fully depressing the pedal this can present the same symptoms.
HTH
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