Sorry to hear about the frustration despite your efforts. That would be really frustrating. I can assure you that your efforts are far from being in vain. You may be pushing up against a plateau right now as far as results go, but keep in mind that weight is really only a small percentage of what you're getting out of your efforts. Learning about yourself, physically and emotionally, as you continue on your journey will prove to be incredibly valuable as you look into the big picture of future endeavors.
How can you stay motivated? What things can be done to stay motivated? Feel the frustration fully... there is life in that. Now choose how you respond to it. In looking back on this years from now, how would you want to frame the story? What can you do to frame it positively? What would your future self want to tell your present self?
Your endeavor is honorable and worthy. The struggle you're facing is what makes it a challenge, and with it bigger potential for rewards. Recognize that what you thought you were up against may seem bigger than expected, but that you are up for the challenge as it really is, because you burn for the victory of conquering your goals.
What can I, personally, do to help you along? 1 thing, what would have the most impact? Holding you accountable? Calling/checking in weekly? Wait... You don't
need my help. But if you
want it, feel free to ask. :)
Oh, and smile, because of the journey. Don't wait for the destination. You're worth it.