MIL thinks I'm a recluse...

As long as you're content with what you do, Antejexix, that's fine-you don't have to justify what you do, or don't do, to anyone.
Having said that, hypocrite that I am, I do go on to DH as he doesn't go out at all (except to do weekly supermarket shop) and doesn't really have any friends.
I go out to two choirs, keep fit, French, still working a few hours each week. Any social arrangements are done by me and he happily comes along. I do sometimes wonder what he would say if I said I'm going on my own as he hasn't arranged anything? Lol!
He is perfectly content with his own company and, as a very accomplished artist, is always doing some painting/drawing. He loves jigsaws and reading too and when the weather cheers up spends hours in our (beautiful) garden.
Each to his own-live and let live say I.

To me you seem very busy Antjexix and I am glad that you are able to do all that. Whilst it is good that people care about you it is only who will know what and how much you can manage or even want to do. It is irritating when people assume they know better than you do yourself but you don't have to take any notice.

Sounds like you have a lovely life that suits you. Enjoy.

Well I will enjoy my me time.

I do go to social things. I arrive late and leave early, usually without saying much. I'm a happy introvert. hugs

Maybe MIL is lonely and finds it difficult to understand how content you are with your life as it is sounds pretty full to me I know how much work grown-up children can create when they are living at home if you're happy ignore the interfering old b.t

She'd be alright telling me, Yippee! I'm out tommorrow . . . to the hospital! That's about as good as it gets.

Maybe though, she was glad that you were getting out to the bingo with her and it's herself who wants the company?