| Atarlost |
You've basically got two options.
You can explain to your GM as repeatedly and loudly as it takes that the Pathfinder rules are written with the unshakable assumption that PCs will have unfettered access to magic items. The AC math doesn't balance out without rings of protection and amulets of natural armor. The saves don't progress right without cloaks of resistance. High level feat stat prerequisites can't be met effectively without stat boosting belts and headbands and even low level prerequisites will be more painful without the potential to boost your primary stat later.
Your GM must either give you those bonuses or nerf opponents and reduce stat prerequisites or the game will break extremely quickly as you level.
Or you can find a GM that isn't going to try to fit a square game system into a round setting and then refuse to alter things to fit.