I'm so empty inside...if i think about life i wanna cry...it's like I'm sad for no reason...i just wanna run away...i don't understand!?

Any feelings that we can possibly experience are normal. Not being able to find the reason why you are sad sometimes makes you feel like there’s something wrong with you. There isn’t! However, if you would like to learn why you cried or feel sad, it’s important to do self-inquiry (talk with yourself). Also, exercising outdoors can provide both sunlight and mood elevation. Develop a toolkit of stress-reducing activities, such as regular exercise, yoga or meditation, watching funny movies, playing team sports, doing something creative or novel, hanging out with and/or confiding in understanding friends. By no means am I saying that you should ignore these feeling especially if they start interfering with your daily life or if they become more severe. In that case you should talk to someone you trust and understands you or consult mental health professional