Has have been pointed out the cost of a boat and partly its seaworthiness have to do with weight. you should compare, as Marty as done, your boat with a boat of a similar weight, not length.
If you do that the story would be completely different in what regards interior space, seaworthiness, speed and even sea motion. Your boat has the advantage of mass for length (for the ones that prefer that kind of motion) but the big disadvantage of a much shorter LWL and that, as also have been pointed out, is very important in what concerns wave passage and the pitching movement of the boat.
This is a comparison between fin and full keel, the biggest difference between fin and full keel boats is that fin keel boats are much lighter, that is the point...to compare boats of the same size and different weights is a more accurate comparison...a typical weight fin of the same size as a typical weight full is about half.