hello, lack of motivation and depression are joined at the hip, so to speak.
What happened to me when I was in depression is that I also didn't want to do a damn thing, nothing except sleep, watch TV and drink alcohol, except for one thing, I had a friend close bye me or a stones throw away, and he called around everyday to get me out of the house, I certainly didn't want to go with him, but he encouraged me, or in fact told me to go with him.
Sometimes I would try and hide from him, but he always knew where I was, or I would say to him, 'I'm not interested, come back tomorrow', but he persevered, and said that by getting out of the house I would feel better.
I knew this deep down but never had the strength.
For you I would get a close friend or a work mate to do the same as what happened with me.
You need the stimulus from people who are close to you and you both can talk about anything, because you can't have any motivation by yourself, it needs to be encouraged by other people.
We may not want or like this to happen, and remember any plans that are made for in a month's time, it's alright in four weeks time, but as the time gets closer we start to think of excuses of why we can't do it, and on the actual day, we say 'we don't feel well enough to go, so go with out me I will OK'.
A common way of avoiding this activity from happening. Geoff.