The main cause is stability.
Most Walmart kayaks are not designed with open ocean swells in mind. Is your kayak a sit on top or sit inside?
Did you buy it new? If so i would return it and buy a used kayak from craigslist. If budget is an issue, a used malibu, wilderness systems, or ocean kayak will be way better suited to go out. You dont need a Hobie to have fun but you do need a well designed kayak.
If you go out in the Walmart kayak you might flip and get discouraged with our wonderful hobby.
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-Beto
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