Replying to Boot Help!!

So the beginning of my season was today and I'm riding with last years full tilt boosters which I got last year. They're a men's 8 or in the boot size there 26. The problem is I wear a men's 9 for school and everyday life. I thought that I could handle the boots and get new ones next year but today while I was skiing I had extreme pain in the bottom of my feet and my ankles. Also my toes were squished and the nails hurt. So my question is do I need to buy a new boot and a bigger size or are my muscles just sore and I'm not use to using those certain ones? K+ for helpful answers