Taking a false oath

Q: If I stated a false oath on Quran, for example I say that I swear in the name of Quran that this thing hasn't happened etc. and that because of some complication between husband and wife, to secure their relation is that allowed in Islam? Kindly guide me because I did this to secure a relationship by saying a false oath. Was that wrong or right?

Court marriage

Q: My question is regarding my marriage. When I met my husband I wasnt paying much attention to religion so we married in court as civil marriage. My father and mother left me alone in another country so I didn't have any wali present on the day we got married. Now since I learned more about Islam and I am concerned, I would like to know if our marriage is valid?