Hi aqua
I've read a couple of your threads and it does sound like a you've encountered tricky times in a few different areas of life, all over the past year (?) or so - by which I mean you've had a baby (and all the life upheaval that comes with that), work has been tricky/is ending for you, you sound pretty unhappy.... You've said you feel trapped.
I suppose I'm wondering how you think you might start to feel untrapped? What would not feeling trapped even look like for you?
The SAHM thing is a bit of a red herring because I don't think there is an answer anyone can give you that is magically going to minimise the reality of it which is that if you are at home, caring for your baby, the baby-caring bit will, by necessity, occupy the majority of your day. Not all of it, hopefully, but big chunks. Your decisions there are about how to spend the time around the edges - as other posters have suggested, this could be gym, housework, voluntary work, study, listening to music, sleeping, walking. Galleries, chatting, making new friends, exploring places, going to the supermarket or something else. But any of those things, if done with a baby, will still feature the baby predominantly.
Sorry if this sounds obvious. It is really. But sometimes it helps to recognise a situation for what it is.