I can understand how you feel as even i was suffered from depression myself for many years. Dipression can be genetic problem too so check in your family has someone suffers as well.
You can get help through therapy and sometimes medications, you can find relief. Always remember you are not alone your family and we friends here for you. You will get help by journaling as it can be therapeutic as well. in study it is shown that over 50% of human beings suffer from anxiety and depression at some point in their life.