What kind of poem is this Let me not to the marriage true minds Admit impediments. Love love Which alters when it alteration finds Or bends with remover remove. O no! an ever-fi?

The poem you provided is a sonnet. Sonnets are a specific type of poetry that follows a specific structure and rhyme scheme. This particular sonnet is a Shakespearean sonnet, which means it follows the traditional Shakespearean sonnet structure of three quatrains (four-line stanzas) and a final rhyming couplet (two-line stanza).