I was married with children and STILL spent the whole day in bed crying and depressed! Marriage and children are NO GUARANTEE that you'd be any happier than you are now. Don't judge your life by what others do or say because you might end up rushing into something and wind up with an abusive husband like I did, and spend years trying to find a way to safely get you and your kids out of the relationship. So, it COULD be worse! Take it easy on yourself. I think it's pretty common for women to feel like that when they turn 30. You'll be ok.