You may want to read this article regarding self breast exams:
I do not do a lot of checking unless I have a sx that could be anything from benign to a malignancy. If I have a problem, I will just go see my physician and find out what is wrong.
Many people do check for lumps or bumps where they feel they should not be. Try to stay in the moment and cut down slowly on these checks until you feel less stress.
Have a wonderful day.