Assalamu alaikum. I am happy with my current job, and want to marry. I have liked a girl but I didn't officially propose her. Her body is devoid of an ovary due to an appendix operation complexity, but I like her because of her personality and I have no problem regarding her physical defect. But my parents not only want me not to marry her, but also are telling me to try for a higher rank job. My question is, if I don't listen to my parents in this circumstance, will I be sinful? Jazakallahu khairan.

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

It is more appropriate to obey your parents in choosing a fertile wife as long as you are not harmed by leaving the girl whom your parents refuse your marriage from; as the Prophet said: "Marry the affectionate and prolific women, as I will outnumber the nations by you (by your abundant number)." [Sa’eed Ibn Mansoor]

Ibn Qudaamah said in his book Al-Muqni’: "It is recommended to choose a religious and prolific wife, who is virgin and has a good family lineage."

Al-Munaawi said in Sharh Al-Jaami’ As-Sagheer: "It is disliked to marry a barren woman."

Moreover, you should obey your parents in moving to the job that they want you to move to as long as you are not harmed by doing so.

However, if you do not obey them in regard to not marrying that girl [by marrying her despite their refusal] or leaving your current job, then it appears to us –Allah knows best –that you are not sinful. However, you should still be dutiful and have a good conduct with them, as the right of the parents on their children is great and being kind to them is one of the best acts by which one gets closer to Allah and attains His Pleasure.

Allah knows best.