, where I can relax after a hard school day and be myself. If I leave my home, a piece of it will be always in my heart.

Необходимо образовать наречие от прилагательного difficult.

Difficult преобразуется в наречие difficultly, но более подходящим по смыслу является hardly.

Hardly, where I can relax after a hard school day and be myself. If I leave my home, a piece of it will be always in my heart.

Ответ: Hardly