How do i motivate myself?

Apologies if this is a common post here. 28F, 245lb at 5’5” but naturally muscular. Carry a lot of weight in my chest and legs but started gaining due to depression and its starting to show a lot in my stomach and arms now. Always been “thicker” which i dont mind but i want to get to a smaller size so i can buy clothes more easily and get on top of some health issues. I guess my question is where the hell do i start?! Im so unmotivated and tired despite wanting so badly to exercise. My diet is shit too so i could work on that too but its really the lack of exercise i struggle with. Anybody have access to an easy fitness guide? Budget is very limited and when i had a gym membership i never went. Have some gym equipment and a max trainer but I’ve developed asthma so i have to be care about cardio. I need something that i can consistently do thats not miserable to think about. In peak condition i was deadlifting and doing calisthenics but i wasnt on antidepressants and hormone control then so it was easier. Im just sick of making excuses but i dont know how to make myself start. Any advice welcome

Tldr: im unmotivated and have to break the cycle or ill never get fit