Joking laughing and what feels is a constant reminder of my failed marriage

I know my sister very well to know she likes to joke, a lot. Especially at anything that happens to me or my younger sister,that's fine.

However,sometimes and more often than not.... She brings up how my decision making to get married this year was bad and a mistake (which is was) then she always does the same old impression of me as though I'm this "immature girl" who didn't know what she was doing.

Yes I did rush into marrying this year but I did it for no other reason than it just felt right.

She tells people about the situation and I'm embarrassed enough as it is that my husband turned out to be emotionally and a bit psychically abusive so I moved back to the UK. But like. Said I'm embarrassed about it for her to talk about it to new colleagues at her new job.

My family have been understanding of the whole situation. I'm living with my sister now as a temporary thing until I can get my own place once the baby is born *touchwood * he's due on the 13th Jan.

This last year and everything I've been through has really taking its toll on me, I am depressed because of it but normally I'm a naturally happy person so I try to keep busy to take my mind of it but I still cry and have breakdowns.

I just sometimes don't appreciate how she makes me sound like a dumb immature little girl when she does an impression of me when I said I wanted to marry my fiancé this year.

I'm over reacting right?

Yes I can take a joke, just sometimes things like that can stay in my head and make me feel more like crap when I'm down.

Opinions please ?