Is it possible? Of course! Captain
Bligh and 18 loyal members of the Mutiny crew sailed 3,000 miles across the South Pacific
in a 23' open launch. A couple of different people have crossed the Pacific in boats less than 20' long.
The question you want to ask is not, is it possible? The answer to that is always "yes." The question you want to ask is, can I make this journey safely, in this boat, in the degree of comfort that I desire? And that is a question that only you can answer, because the answer depends entirely on your abilities, your preparation, and just what creature comforts you expect.
Good luck, in any case.