Welcome to the Wefugees Community and thank you for your question.
The platform and our experts are based in Germany. Therefore, we might not be able to share too many information or experiences on life and regulations in Italy. However, the topic of marriage in Italy was discusses already a couple of times here as well. Please see, for instance, this thread for further details.
As you are mentioning that you are an orphan - I assume it is quite difficult for you to provide all the required documents? Unfortunately, I don't know if there are any exeptions or special regulations in this case. I would highly recommend you to get some individual advice and support by a local organization supporting refugees and migrants.
I hope this helps and all the best,