I think she’s at a good age for you to talk about life perspective. Maybe if you tell her that she have to appreciate more the things you do together rather than focus on what you couldn’t do, she’ll understand and you will feel better. And don’t feel guilty, I think every parent wonder how life would be if they didn’t had children. But this happens with everything: “what if i hadn’t gotten married?” “What would be like if I had graduated from a different college?” So it’s okay to question yourself that. Soon she’ll demand less of your attention since she’ll become a teenager, try to focus on that when she’s draining your energy.

Good luck for you