If your family is like you describe, their restriction does not have a value legally and you must seek for  an imam to be your wali if there are no relatives from your father’s side that are practicing Sunni muslims.

My family like me to marry someone with ‘degree, career & educated family’. My family is wealthy bi’idhnillah but I am not like my family and I feel compatible with someone simple like a Muslim working in shop. my father is not practising Shia. If my family (Agnostic or Shia) disagrees or threatens, what path should I take? I do not want them to feel bitter with Islam