I found the missing link, i.e. bridge:
don't get my back against the wall
I need some space to breathe and roam
do understand I'm not your thrall
I'm not the man who'd stay at home
Yet again I used http://www.rhymezone.com/ to find rhymes for 'wall'. Among others I found 'fall', 'call', 'at all', 'thrall'. I'd never come across the term 'thrall' before, but after looking it up in http://www.dict.cc/ I found it quite useful.
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