This just brought a big smile to my face because it reminded me of a memory of when my (likely autistic) son was little. He used to say “my BODY won’t LET ME!” all the time. In retrospect, that was a very good way he came up with to tell us about his needs!
We got him books that showed faces labeled with different emotions and did lots and lots of working with him to learn to identify and articulate feelings in himself and others.
We’ve also had to be very explicit with him (to the point of feeling rude at times) about which social rules and mores he needs to follow. He doesn’t pick up on unspoken rules well, but is great at following rules when he knows about them. He is also very honest and lacks deceit. This is in stark contrast to his intuitive younger sibling. Our strategies have really paid off over the years and he is doing great.
I love the other suggestions in this thread.