I live in a western country where polygamy isn’t allowed (registered), however, I have strong feelings about a Muslimah. we both are Baligh. My question is, can I perform my own nikah, we both can read and recite Arabic.

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You can read your own Nikkah provided you know its conditions and know how to recite it.

However, it is advised that you do not get into a relationship that will cause the break up of your family or get you in legal trouble.