One of the most impossible lessons of personal growth is about not fixing blame. The specific person and specific circumstance that knocked you down were almost surely wrong, somehow. It might have even been on purpose. But, you must ignore all of that and do nothing but take the next step.
You demonstrate how grown up you are by the size of problems you shrug off. Everything should be no big deal. Don’t ball up into your emotional hideaway and crawl into a bed of blame and shame. Take the next step toward your own progress, not justice for yourself.