To be classified as an English sonnet, a poem must have:
* 14 lines
* Iambic pentameter (five pairs of unstressed and stressed syllables per line)
* Specific rhyme scheme: ABAB CDCD EFEF GG
* Three quatrains (four-line stanzas) and a final couplet (two-line stanza)
Without the poem itself, I can't tell if it meets these criteria.