Just not seeing it... (long)

... a future of me having a family. My mum and sister have been nagging me to get pregnant so my nephew can have a play mate and my mum can have more grandchildren, but I seem to have zero interest. Sex drive is missing, and sex life is mundane albeit rare these days. Maybe I'm depressed or something because I just don't like the world my kids would have to grow up in, nor the world that I would have to be a responsible parent in. I already feel trapped in a very mundane, stagnant relationship. My SO of 3 years hasn't had a job for nearly 6 months, seems to not care about his health and body by eating crap and lazing on the computer every day, he doesn't really pay attention to the little relationship problems that are coming up more and more. And I feel like I'm working a lot to support us and he doesn't appreciate it, I'm also sort of supporting my job seeking brother who lives with us. They're both lost in their worlds and I feel alone, craving some kind of spark that will bring me back to life and make me want to have a healthy happy family one day. If I can't cope now, no way will I cope with the stress of having a family with this stuff going on. Kinda feeling like a mum already here and not enjoying any minute of it.... Been in a few abusive relationships in the past so I'm didinitely thankful for what I have now but... I just don't feel happy. Am I being a spoiled whinger?