To the best of my knowledge, there seem to be several items that you ought to pay heed to them (and factually perform them) to be a Shia Muslims, such as:
Believing in Allah (the oneness of God) (which is common between
Believing that Prophet Muhammad (pbuh) is the apostle of Allah (which
is common between Shia/Sunni)
And actually Saying ...
You keep your family and Sunni friends, you don't go to them with your new ideology of Islam. If they had questions then you answer. If not be silent.
You have already said the shahadatyn so you were a Muslim and still will be.
You need to acknowledge the existence of Imam Mahdi as your current Imam (من لم یعرف امامه مات میته جاهلیه) and ...
As per Islam they are correct in not allowing you to marry her, although they are wrong in saying a (Muslim) 'Bohra' man may marry a Hindu girl. Perhaps in their cultural 'Bohra' customs this is acceptable, however Islam only permits its male adherents from marrying People of The Book (′Ahl al-Kitāb). People of The Book refers to Muslim, Jewish, and ...