The practice of asserting yourself goes far beyond setting limits.  Assertiveness involves awareness of your feelings, speech, tones, and actions.  It involves your ability to truly know yourself and assess situations to respond consciously.  With awareness of your true feelings and unconditionally accepting them, you can then move beyond limiting habits that impede personal growth.  Remind yourself that feelings are okay and they are merely energy moving through you.  They are neither good or bad.  Be mindful of when you fall back into the habit of discounting or obsessing in them.  This is your turning point!