Hello Sonne: Yes, it certainly sounds like your hubby may be struggling with some depression. But it is also possible that this is simply who he is. One thing you didn't mention is whether or not this is a change. That may be the telling factor. If he used to be more dynamic & now this is the way he's become, then it's likely he's fallen into a state of depression. On the other hand, if this is just pretty-much the way he's been in general, he could still be struggling with a more long term depression, or perhaps this is just who he is. Either way, if your husband is satisfied living the life he's living, & he's functioning day-to-day, then what we imagine might be going on with him doesn't really matter.
Actually, to a large extent, your hubby sounds quite a bit like me. I do have a couple of hobbies & things I do around the home. But a lot of my time is spent on the computer. I think my wife sometimes gets as frustrated with me as you are with your husband. The difference is we're older & neither of us is particularly interested in being out in public or in spending any more money than we have to. So the range of our differences is smaller. However, from my perspective, I live the life I live at this point. And I want her to live the life she wants to live. The difference between your hubby & me, I guess, is I have no expectations with regard to what my wife does.
You can only be responsible for yourself. Simply decide what it is you want to do on a day-to-day basis & do it. Make it clear that you're going to live the life you want to live. Would it be nice if your husband would join you in your activities? Sure... but that's just not the way it's going to be apparently. If your husband continues to be a ball-&-chain, so to speak, you may need to consider whether or not this is a relationship you can sustain. No good will result from you too being dragged down further into depression, or whatever it is that's happening with your husband. Good luck...