HI there,
It is certainly a symptom of depression. Different people experience different symptoms and not always in the same order. This is why depression is more complex than people realise. If you are concerned, I would go and see a doctor and start a set of therapy sessions. The earlier you start treating it, the easier it is. For most people, the depression has been there for a while before they notice the symptoms so you may have had it longer than you realise.
Darren