I'm sorry you're feeling badly.
Congrats on the weight loss so far! I have lost around 75 pounds so far & I have also found myself feeling like what is the point sometimes. Although 75 pounds is a big achievement... still having another 100+ to lose is discouraging.
But, living a healthier lifestyle isn't just about losing weight. Any quick fix wouldn't last anyways it's something you'll have to always work at. I'm trying to see it as I am doing small things to gradually get healthier & the weight loss is a byproduct of that.
You should keep going because eventually it will pay off! If you keep doing healthy things for yourself you will eventually start to feel better. & You're worth being nice to (so be nice to yourself!)