Hello Friend, Good that you are seeking a help. Yes, depression will exhibit such lack of interest and negativity in life. Any problem can be solved if you ventilate your emotions to someone who can listen to you . Better you  take a counseling support to assess yourself first and figure out the root cause of your problem. I am sure you will be able to see a different prepective of your problem and possible  solutions to overcome. Don't hesitate.

Feeling low, having crying spells, sleep and appetite disturbances, and difficulty in concentration and attention are some of the signs of Depression. Consult a Psychiatrist for a detailed assessment. It is likely with medication and counseling the symptoms will improve. If you are feeling suicidal or hopeless consult a Psychiatrist immediately.