Am I suffering from depression?

I think I may be suffering from depression. My father suffered from it and as a result he took his own life. I'm starting to feel bored with life and I don't find things interesting anymore. It feels as though I am living without purpose. I have trouble socializing with people and I can't keep a conversation. I used to be sociable and energetic, but now I just keep to myself and I am quite quiet. I obviously had a tough past, but I don't know what to do to make myself feel better. I am wondering if depression is hereditary and what can I do to prevent it?