Depressions Hallmark symptom is sadness. There doesn't have to have huge stressor in life to make you feel miserable.

Do you have other symptoms? Is it hard to get out of bed? Sleeping too little or too much? Change in appetite? Suicidal thoughts? Loss of interest in things you liked to do? Those are the other symptoms. If you can relate to those and they happen most of the time in the last couple months or more it could be depression.

It could be a physical symptoms. Things like thyroid issues can cause depressed feelings. Have you tried to go to the doctor to rule out any physical causes?

6 Conditions That Feel Like Depression But Aren't