The thing is now done. You can’t undone it. But, you can work on the issue.
What about trying ways to communicate to the people you have the problem with in a calm and assertive way. Take you time to face to the situation with the person who is really involved in the event. Not your mother, or your friend.
So, you won’t keep pending things one after another inside.

Meanwhile, to take a little distance and act with cold feet, you could write about the situation and the feelings it woke up on a journal, then do some kind of activity to calm you down and when you are ready, talk to this person and tell them what you didn’t like, how you felt and saw the situation, establish boundaries or whatever you need to tell them in a calm way.
After doing this you will feel stronger and able to handle any situation. It takes practise but you can.