I don't think the weed's helping you, I'm also a weed-smoker myself and I find that now I care about very little things, basically I feel the same way as you. I've often described myself as feeling numb because, like you, I have very little interest in doing things. In short, I can really relate to you.
It might also be that a vicious cycle that you're in - you don't feel anything, so you smoke weed as a release which in turn numbs what you're feeling and makes you less bothered about things, so you end up feeling like this and end up smoking more weed.
Maybe you could smoke less weed as opposed to stopping completely? This may help you; in my experience I've found that when I've smoked less or stopped for a while I feel more lively and willing to do things.
In short I can relate so much to what you're saying and experiencing, so you're not alone there. If you want to you can PM me if you have any problems that you want to talk about or just to chat generally, my PM box is always open (:
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