Perhaps, "I'll lie to get what I want" was a poor choice of words, but the point that all fulltimers don't have a "real" address is well taken. If we were to fulltime, we would use our son's address as our "legal" address. I've seen it on these forums lots of times. Not everyone gets a mail forwarding service, but use family instead. I've also seen it suggested numerous times to NOT tell the financial institution that you'll be fulltiming. It's much easier to get financing (assuming all the other financing criteria is met) when you currently have a place to live with a valid address. They don't need to know what you plan to do in a few months after you get your loan (as long as you keep up your payments.)
I agree that perhaps you'd be better served to put some time on your side and clean up your credit. It can be done. I think things would probably go more smoothly all the way around. Our son has severe PTSD and TBI from being a Green Beret. His credit is trashed due to his severe problems,for which he's now getting treatment. I'm not going to judge you on your problems and why your credit score is so low. Sometimes the problems are self-made, and sometimes it's just circumstances. But for the grace of God go I.