I think mine is a joke. What should I do?

I think you think too much. Anyway, you two are on good terms now, that's enough. Why do you always struggle with some problems? Besides, other people's diaries are private. As far as you are concerned, you have no right to read them. If you read other people's diaries, they won't say that you are all well.

If you really care and people don't admit that you used to be her boyfriend, then you have two choices, either break up with him or forget the past. Since you think you are a joke, you don't want to give up this relationship. Everyone should be responsible for their own choices. You can't think about this relationship any more, and mind that others didn't admit you before.