While what you say is both very true and extremely effective I think, particularly for your first steps on weight loss. The motivation to hit the Gym regularly is not there.
I would think, Particularly in this case where I believe the OP is particularly over weight. Exercise in a Gym may be both difficult to sustain and also possibly embarrassing? (depends on the individual ofc)
Yep, sorry, didn't even think about that, it does completely depend on how big the OP is and how comfortable they are working out in front of others. But if you go to a good gym, everyone in there should be supportive, because at least you're trying to do something about it and not letting it get worse.