You haven't gone through with it yet because you ain't done yet, man.
Our stories are somewhat similar. Trauma at a young age, serious back issues, drugs, etc. I swallowed 4,000 ibruprofin once, and my dad wouldn't have found me downstairs unless he had an inkling that I strangely might want a sandwich from Arby's (even though I was painfully anorexic). Anyway, I digress...
That wasn't the only time I tried to end it. However, many times since then, I have thanked the powers that be that I was unsuccessful in my attempts to end my life. I still hit a low, every year around Christmas (I'm avoiding the bipolar crash this year with copious amounts of meth, seems to be working...) where I do nothing but fantasize about driving into oncoming traffic and all the fantastic ways I could die. I hate that my family loves me. I hate that they want to help me. I hate my friends for liking me. Why the FUCK would you like me? I hate me...so much...it's almost incredible. Yet, somehow - there's one little tiny intsy bitsy weenie bo-teenie glimmer of the old me, hope, somewhere deep down inside of me, and guess what - you've still got it. You know what that little intsy bitsy thing says?
Your parents fucking love you, because you are their kid, and you're a cool kid. They are helping you because they have hope for you, and they're STILL GONNA FUCKING LOVE YOU, no matter how badly you keep fucking up, and keep trying to push everybody away, and keep slowly trying to kill yourself with drugs, and wish things were another way...
Pain blows. The past sucks. Everything sucks most days. Fuck it all. But I'm still here, you're still here, by the grace of something...something wants you to KEEP FUCKIN' TRUCKIN'. I hate every word of that, because...it's true.
Keep truckin', man. Find SOMETHING that you like. Anything. Scribbling, building ant hills, digging holes for squirrels, biking, flying a kite - anything that might squeak a smile out of yourself. 1/1000th of a second of glee. It's a beginning. A measly one at that, but shit's gotta start somewhere.
I truly wish you the best, and even though I don't know you, if I was there, I'd give you a hug, rub your head and tell ya that everything's gonna be allright.