A stormy but magical night

With the storm raging outside, I lay listening to Dudley's incessant snoring, the faint glow from his watch casting a dim light on my face. Counting the dust particles on the ground, I was going to celebrate my 11th birthday to myself. The wind howling outside of the house didn’t make me feel frightening, but the letter sent by Hogwarts School of Witchcraft and Wizardry haunted me. What was that letter about? Was that something about my parents? Second by second, I heard that Dudley's watch began to count, I used my finger to draw a cake with some candles on it, wishing my 11th would be all fine.
Suddenly, the minute I wanted to make a wish, the door slammed open with a “bang” sound. I was utterly terrified and the thunderous crash woke my Aunt and Uncle.” What’s that!”, screamed Dudley with his eyes all in round circle. I looked at the door which was fully sized by a gigantic person.
“Oh, my god, the wind is really big,” he said to himself and tidy up himself. I was in a complete shock, my mind went blank. Hearing my Aunt and Uncle rushing to the first floor and a gun was on my Uncle’s hand, I stealthily concealed myself behind the rocky wall with my heart ready to have a trip out of my throat itself.
“Please leave my house right now sir!” , my uncle shouted at the giant and I could see him trembling all over, so did my aunt. “ If you don’t leave my house, I will sue you for trespassing!”, he continued. But the giant wasn’t afraid of him at all,” You?”, he asked, and then grasped the gun on my uncle’s hand, bending it out of shape. I could feel that I was trembling,