The brick is meant to shoot away when i touch it, but it shoots away when the game starts up. help?

function startBelt ()

while true do

	script.Parent.Velocity = script.Parent.CFrame.lookVector *50

	wait (0.01)

end

end

startBrick = game.Workspace.woof

startBrick.Touched:Connect (startBelt)

local belt = script.Parent

belt.Touched:connect(function(hit)
	if hit then
		if hit.Parent:FindFirstChild("Humanoid") then
		script.Parent.Velocity = script.Parent.CFrame.lookVector *50
		wait(0.01)
		end
	end
end)