I didn't leave (well, get kicked out) for either of those two reasons. I just couldn't endure to the end. Not through not trying... I just cant live up to the standards and I can't try anymore. I can't pray, study, or cry anymore. I was in a state of guilt and fear the whole time for not being able to measure up (now I'm just in fear). I'll always remember that song about 'thousands falling on my left and right side'. If Jehovah's standards are so high that 'thousands' are going to fall, I am sure to be among them. I know my faults.
When I was young, I remember being out in field service with and elder when he told me that Jehovah was drawing people with 'good hearts' into his organization. I asked him 'what if someone doesn't have a good heart, can they change?' He just shrugged his shoulders indicating he didn't know. Since I was 'born-in' I was sure I didn't have a good heart but was there just because my mom brought me in, not Jehovah. I continually prayed for God's spirit so I'd be able to please him and have a good heart. I did all the things I was supposed to do but eventually couldn't continue because my own thoughts condemned me. I never got the 'peace of God that excels all thought'.