You lot are amazingly insightful, hence this post on here. I suspect it may appear a little jumbled, but I'm thinking aloud so to speak.
I spend all my time at work, with my kids or alone. This is through choice. I'm an introvert - despite getting along with people very well in general - and a homebody. I'm happy pottering about at home. However this is heavily interspersed with doing the wrong things. I'm not a smoker or drinker, but eat too much. And watch too much television. Reading and music feature a lot. I spend too much time on my phone. My sleep schedule isn't the best.
All along, I've considered myself happy with this. But what if I'm not. What if life would be better and more fulfilling if I took up more pastimes? Try it, you'd probably say. But the truth is, I'm 49 and too lazy. I feel flat a lot of the time.
I have a colleague who I get along with fantastically well. She has a partner who really encourages her to be her best self, and who exposes her to new experiences and interests. He is also more sociable than her, and she has met new people through him. She's really happy, despite being an introvert.
Maybe this is what I need, since I lack the self-discipline to do it on my own. I do feel I'd benefit from someone who'd open me up to new experiences.
Life is all about balance, and I have swung too far one way. I can't help but shake the feeling that I need to put myself out there more, but I really do lack the motivation. I AM contented at home but my world has become so small. I'm also overweight (with an unhealthy relationship with food) and have given up on online dating.
I'm sure I could be happier. I'm probably not as happy as I think/say I am. But as I say, I don't try to change things. My mentality is 'I work hard, so I deserve to relax at home'. But what if I'm just hiding away from the world, and there's better out there ...
Hopefully this post doesn't sound too wanky, like some kind of menopausal mid-life crisis! But maybe there's someone out there who can relate 
I should add that I'm going to a concert with my colleague next week, and had a week's holiday with a friend during the summer. So I'm not always a total hermit ... just most of the time! 