I am a bit confused myself to be honest lalliv, and I can see how you came to your conclusion. I had to look it up myself. The feminine side of "god" is the "I am" that the Gnostic writers attribute to the narrator of the poem.
I think this is way to deep for me, a poor agnostic to grasp lol
Here is what the commentator says with regards this poem
Thunder, Perfect Mind (NHC VI,2) presents the revelation discourse of a female divinity who speaks alternately in first-person statements of identity ("I AM") and second-person address. The text's parallelism of structure, together with its extensive use of antithesis, paradox, and other literary devices, point clearly to its poetic or hymnic character. B. Layton has argued persuasively that the paradoxical and often outrageous pairing of antithetical terms in the "I AM" statements of Thunder can be read as a complex identity riddle to be solved by the knowing or "gnostic" reader. At the same time, attention to various features of the text as a whole suggests that it is not only the mystery of the speaker's identity, but the relationship between the divine speaker and her human hearers that forms the exegetical crux of the text.
Thunder focuses attention on the hearers' relationship to the divine speaker not only through its alternating structure of first-person proclamation and second-person address, but also through its metaphorical imagery of kinship and gender, its references to the audience's responses to the divine, and its claims about the speaker's role in the operations of language and intellect. Its persistent, uncompromising use of paradox pushes its hearers to relinquish the apparent sense of its words and to seek the hidden meaning of individual utterances and of the discourse as a whole. Finally, by locating the divine in the "voice" and "hearing" of the text, it leads its hearers or readers to find the divine within the text and within themselves, and so to discover themselves within the divine. In such an interpretive movement of letting go and finding, of becoming sober and being found, the text's final words suggest, the reader "goes up" to the salvific "place of rest," "finds" the divine persona revealed in the text, and "enters into" a state of living and not dying again.