GOAL is an organization who has been working very hard to try and reverse the draconian gun laws of this state and I wholeheartedly support their efforts at education and reformation.
Regardless: you should only join/support groups that you feel are worthy. If you don't like the NRA or the NRA's actions, then I don't see any problem with you not joining (others may have different opinions). Just because you're a gun owner doesn't mean you have to join any group. However, if you find that a group is working on behalf of views that you hold (say a local group or another national association like those mentioned), then it certainly wouldn't be a bad thing to support them.
Now as far as owning a gun and barely ever shooting it, I'd probably give you a lot more grief (knowledge, training, experience handling, etc.). :)