You may often have feelings of stress, maybe even constant but you probably find you are focusing on individual problems rather than stress as a whole. Stress can be a vicious circle and it may be important to understand at what stage of stress you are at and also what is the cause of your stress. Not everyone is willing to talk to a shrink and may be unwilling to talk to family or friends or have trouble making them understand you: this can lead to further stress if you feel misunderstood and make you feel very isolated and lonely. If you are in this situation though you may need to help yourself, at least at first and you may then be able to explain your problems to others more succinctly and help yourself; not understanding why you are stressed does make it difficult to explain.
There are many self analysis tests and templates online including multiple choice questions and SWOT analysis. These may help you identify that you are stressed and that your stress is severe confirming a belief you may have had somewhere but been unwilling to admit before. Admitting you are stressed and that it isn’t something that is going to solve itself is important: how hard it will be to deal with your level of stress depends on how far it has gone. Stress often starts as small things which build up, you may start to feel less satisfied with life or constantly under pressure: this can lead to a burnout and depression eventually though in some cases it takes a number of years: making it harder to spot for you and those around you where it is gradual.
Stress can be caused by home life as much as work life and may be worst where it is both together. If you are frustrated with your job or relationships, irritable with family and coworkers and feel isolated and misunderstood these are all significant indicators of depression, though your job and relationships are not always the cause.