You can be the person you once were because you have been that person before!!!! I have faith in you!!! Try to analyze why you are feeling sad.... Is it a lack of purpose? Low self esteem? Once you get to the root of your depression it will be easier to overcome.... I will check back in on this post.... let me know if I can help!! I recommend therapy because talking things out led me to come to my own insights that helped me overcome a really dark phase I was going through.