What is the optimal course of action given a girl's desire to marry a committed young man whose aunt has proposed to her on his behalf, yet the girl's family might reject this marriage due to a weak connection between the two families, coupled with the girl's fear of a family conflict and her parents considering her too young for marriage and wishing for her to complete her university education?

You must consult your parents before proceeding with marriage, as their consent is a condition for the validity of the contract. To avoid problems, you could limit the attempt to having your aunt inquire from the young man's family about their willingness to propose to you. If they express interest, your aunt can try to persuade your family. If they agree, then praise be to Allah. Otherwise, you must turn this page and stop thinking about the young man. Allah will compensate you with something better if you obey your parents.