First, quit talking yourself into the corner where failure means a slow tortured death. That's what I found out when talking to someone after leaving another profession and pursuing the one I longed for terrified me.
Then talk honestly with someone about what it would mean to get the degree, or graduate, or practice at whatever your education level and decide you hate it, can't do it, or can't make the grade.
Learn where your own monsters under the bed are, those intense fears that creep up on us, get a flashlight and discover they're not real.
And please, take action before you actually consider harming yourself.
You can do it, become who you want to be, do what you WANT to do. Take some pressure off. Godspeed.