>>933819>>933821>>933825>>933827I'm also around the same at 6'3" and 230, I can tell you now that 13-14 ft is really the minimum for and kind of handling if you're sea kayaking, and at least 11-12 ft if you're sticking to rivers.
Anything shorter than that is either for specialized kayaking like surfing or whitewater or is just pure meme-tier.
If you can't afford a decent kayak of that size, you could always build a skin on frame for a small fraction of the price of say, a real 17 footer sit-in sea kayak (which, if you get to enjoy kayaking at all, is what you'll want to get anyway.)