Should be "I'm buillding my own jail"
This song is about being an alchoholic, alchohol makes perfect bars for his jail that he's building. But he built the jail himself, so his escape plan can't fail, because since it's his jail, he can leave whenever he wants (meaning he can stop drinking whenever he wants, but in reality he can't, because he's an alchoholic).
Should be "I'm buillding my own jail" This song is about being an alchoholic, alchohol makes perfect bars for his jail that he's building. But he built the jail himself, so his escape plan can't fail, because since it's his jail, he can leave whenever he wants (meaning he can stop drinking whenever he wants, but in reality he can't, because he's an alchoholic).