It feels like you got to high of expectations on yourself, that you should go from 1 to 100 in a snap, without failure.

That is very hard to do and is setup to fail, you didn’t give yourself a proper chance. Try doing things in small steps, change one thing instead of everything. Maybe choose carbonated water instead of soda once in a while, maybe skip the fries if you’re eating a burger and replace it with cooked potatoes.

But try changing a few stuff at a time, and make theme routine, and when they are routine try changing something else.

Changes take time, changing your life in a swoop is very hard to do, take your time and explore what works for you.