Hey all guitar heros

couple things, first, i am in my first year learning acoustic. i have a yamaha FS800, it says small body guitar, but it doesnt feel small body to me., i have shoulder issues, and it just feels so high to get my shoulder around and sustain without pain and as well in my upper middle back. Also i have to get a new chair., that has really good back support and adjustable. Any suggestions of a really good sounding small guitar, smaller than what i have, and a comfortable chair? Thanks in advance