Hi. From what you have mentioned, it seems that you are suffering from symptoms of depression. Crying spells, irritability, lack of confidence, low mood are all symptoms of depression. You should consult a psychiatrist to get yourself evaluated. Treatment with medications and psychotherapy will help you get better.
Next Steps
Seek a psychiatric consultation.
Health Tips
Start exercising daily. Start writing a diary daily to ventilate your feelings. Talk to someone close and let out your emotions.