I am 20 and my girlfriend is 23. I am three years younger than my girlfriend, but the first time I met her, I told her that I was 1 year younger than her. Now I don't know how to tell her.

I don't think this is a very serious problem,

In this case, your family's advice is right,

The longer this matter is delayed, the more serious the problem will be.

If she knew, she might think you were cheating.

But if you are formal and sincere, tell her why you are hiding.

I think she can understand, after all, it's not a big problem.

The big deal is that you get married early, get married first, and then start your career.