Hello, my friend, honesty is the traditional virtue of the Chinese nation. I hope you can be honest with others, especially your relatives. My suggestion is to confess to your parents, tell them that your girlfriend didn't graduate from college and accept their criticism.

In order not to affect your girlfriend's image in your parents' eyes, you should explain that this is entirely your personal vanity and has nothing to do with your girlfriend. I hope parents can bless you both. Most parents still respect their children's wishes.

If you don't talk now, get along with each other for a long time, get married and have children, and if you are found out (for example, when you get married, your parents tell your relatives that my daughter-in-law is a college student, and it is easy for her relatives to tell the truth as soon as possible that the girl is not a college student), parents will be very sad that their son lied to them.