Good that you identify your shortcomings and slip ups. Dont put all the blame on yourself. D17.99 is going through a difficult time in her life now as she transitions to adulthood. I cant give you any more advice about teenagers as I have quite a few years before my kids are that age.
I know finances are tight, but have you ever considered any of the retreats, mens groups or mentoring at http://bettermen.org/index.asp
I think they are pretty close to where you live.
Finding a friend that has gone or is going through your similar situation sounds more like you want to have a pity party/rehashing of the past. Look forward to getting your divorce completed. Look forward to spending more quality times with your kids. Look forward to finding someone new to love (and have sex with).