Make a list of everything you want to improve in life and decompose it into atomic facts. Order them by easiest to fix to hardest, then plan and execute actionable steps to rectify one thing at a time. Put everything else on hold and accept that the other things might stay bad or even get worse in the meantime. If one of those things isn't working out after a couple weeks, put it at the end of the queue and keep going. Start racking up a few wins, and before you know it life will look different and your problems will seem less intractable.

For example: Instead of "losing weight", add items to your to-do list like "quit snacking", "stop drinking soda", and "eat one fruit/veggie with every meal". The point is to reduce those big problems into small ones that anyone can fix then start churning through them.