jtb, start with one step that you can do to improve your situation. Whether that's a walk, or going to a meeting, start with something. Don't let your whole situation make you so overwhelmed that you don't get started. You will see that one good choice will often lead to another good choice. You've mentioned getting a job, working toward your education, losing weight, those are all long term goals to move toward. You don't need to fix everything that's not working today, just commit to do something to get started.
Best wishes to you!