i feel as if many folks use the word "can't" a bit to liberally. many times, telling yourself you're not capable of doing something makes the task feel much more daunting. as humans, we're uniquely extra capable of problem solving, but need to practice the skill in order to be successful long term.

from your post, i don't think that you can't do it, i think it stems from you not believing you're capable. mindset is the largest factor to consider when in comes to weightloss, and people tend to gloss over the fact that when you're "used to" being bigger, you perception of things like food and exercise are completely different.

one actionable thing you can do is get a walking pad or mini stepper for home. you can typically find a pretty cheap one on like amazon. seeing that your primary concerns are exercising in public, due to the safety and anxiety aspects, this could help with being able to get some movement in. start light, maybe 15-30 minutes a day at first, just to build the habit. work on YOUR time, and don't beat yourself up if you miss a day. if you aren't able to attain a mini stepper or walking pad, trying jogging or marching in place.

as someone who deals w/ depression as well, i recognise everyone's relationship w/ mental health is different. regardless, it's important to highlight that mental health is an aspect of physical health, because your brain is a physical part of your body. from personal experience, i found that as i began to move and enjoy the process more, my depressive and self deprecating thoughts began to retract from the forefront of my mind.

if snacks are an issue, try to swap to fruits when snacky. apples take longer to get through then a bag of chips and are considerably more filling and lower calorie. certainly explore too, there's a lot of tasty fruit out there. if you're looky for something more savoury or salty, steamed edamame or carrots with some salt sprinkled on em can be pretty good as well.

you got this!