If I had to guess, I would say that you may have initially begun to meditate to escape from negative thoughts and emotions. As such, whether consciously or not, you may have continued to meditate with the goal of becoming numb to these thoughts and feelings. You may have developed a coping mechanism by which you are now numb to your feelings. I would suggest that you embrace situations of true emotion. Re-examine your belief system and engage in activities that are very grounding.