Beating is not at all the right thing to do. It doesn’t matter whether you are beating her or she is beating you. This is wrong. And beating in front of your families is also harming your self-respect. You can ask her not to do it. Or you can talk to your families about this. Try to talk to your in-laws about this. If you don’t stop her now then it will continue in a long run. This is not hurting your feelings or dignity but also it’s subconsciously affecting your mental health too. Every couple fights in their marriage but this is too much. You have to decide whether you can live like this for the rest of your life. Or you can also appeal a divorce in court.