It's natural to be paranoid about such things, but you can overcome it. It is extremely unlikely that someone is just waiting for a good idea to copy (and that yours is the one they will pounce on). And even if you don't tell people, they'll find out when you go live. So all you get is a bit of a headstart.
Really it's worth far more to get a wide variety of opinion and critique, and potentially a cofounder, than it is to guard the idea for fear of having it stolen.
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It's natural to be paranoid about such things, but you can overcome it. It is extremely unlikely that someone is just waiting for a good idea to copy (and that yours is the one they will pounce on). And even if you don't tell people, they'll find out when you go live. So all you get is a bit of a headstart.
Really it's worth far more to get a wide variety of opinion and critique, and potentially a cofounder, than it is to guard the idea for fear of having it stolen.