Probably too big. Generally, you want to have at least 18" of flooring showing on every side, otherwise your rug reads as wall to wall carpeting and may make your room appear smaller. For your room, I would probably for for 8x10 or 9x12. Try taping off imaginary corners with painters tape to get a feel for how either would look in your space.

too big. if u want one large area rug, do a 12x10, 9x11 or something in between

My concern is I don't like the tile flooring so I wanted to cover most of the floor. Will this look awkward?

9 x 12 is probably the biggest you should go.

A rug in a 9 x 12 section may actually measure as small as something like 8'10" x 11'8". Once it's down, with a good looking cocktail table, the floor will no longer demand attention. Hope this helps?