I am in the process of learning Spanish and have been doing the opposite. I have been practicing prayers and reading the Bible in Spanish. And are you in the US? Amazon sells a Spanish BCP at a reasonable price.
Why do you feel obligated to pray in English? There isn't any one "holy" language, and God has used many languages to communicate to people. And even though "Anglican" implies "English", really Anglicanism is the Catholic faith and one need not speak English to be Anglican.