Как правильно написать прописью ' i '; ' I '; (ай)

Вот так пишу я. Фото из Вики.

My favourite month is december. usually this month is unloved. severe winter. but in my opinion it means nothing. i like this month the white beauty. in the end of this month we say goodbye to old year and we meet new year. it is my most favourite holiday. i love december