Replying to My boots hurt...

So I went skiing today for the first time in my full tilt drop kicks in the black and white color way. I bought them used off of a member here. I need a 28.5 for my boots. Long story short my feet hurt so I ended up skiing with no socks on. Really kinda hurt I don't suggest doing it. I was cleaning my gear and noticed the my liner is for size 27.5 and the shock absorbers are 27.5. I do have tongues though that are good for 9-10.5 so I switched out the tongues. I looked on the boot and I couldn't find a size for the boot. I know that full tilt is very customizable and I though I heard that while looking for boots that the shells would be 28.5 the liners would just be 27.5. Do I need different boots or a different liner? I'm sorry if this is a stupid question but I'm new to the skiing. I appreciate the help!

Thanks!!