Hiee I completely agree with dr.ajit depression not always require stressors sometimes endogenous depression can always develop due to neurotransmitter abnormalities.  It is better u take professional advice from psychiatrist it ll help u..

Though currently you do not hv any problems,  the ones which you have not resolved earlier I'd what causing all those problems  in you. Better consult  a Psychologist,  and share with all your feelings and learn to handle snd live a happy life.

You must be going through a difficult phase of your life. Depression, anxiety can cause a lot of suffering. Sometimes depression occurs without any obvious stressors in life. This is called endogenous depression. It is due to neurotransmitter imbalances in your brain. However, the good news is that it is a treatable condition. Just like any other illness your illness can be treated with medications. You must consult a psychiatrist.