Absolutely nothing wrong with liking your own company at all particulalrly if you already have a lot of social interaction as part of your job.
The only thing that strikes me is that the way you have described it doesn't seem like you enjoy your life much - when you die looking back on your life, would you be happy with it? Or would you think "God I just went to work and came home, i just lived to work and take care of the kids, what a waste, I wish I'd done more of [anything that makes you happy] for me"
Its irrelevant WHAT the happy thing is - could be swimming, crochet, yoga, baking, walking, reading, whatever.
If this is wrong and you honestly are perfectly happy, and get joy from being with your kids at home and watching tv, or whatever you do then dont change a thing. In exactly the same way as your extrovert colleague presumably doesnt care that you would find her weekends exhausting, you shouldnt care that she might find your weekends boring.
But if YOU want to make your life less "boring" then you should - but in a way thats less boring FOR YOU not randomers you work with!
Ultimately theres no correlation between someone who is always out and someone who is interesting! I know lots of people who have various very intense hobbies that they are always out doing but tbh whenever they talk to me about them my eyes glaze over. Most people's hobbies and interests are only fascinating to others that share them!