“I’m not living up to God’s expectations!”

Is there any sadness or disappointment in Heaven? Will disputes be settled and bitterness be healed in Heaven? Do angels have bodies like humans? How are our minds renewed? I feel like I’m not living up to God’s expectations. I heard you teach that we don’t need to tithe 10% today. Where do we find that? What about Jesus’ instruction on tithing? I’ve been smoking for decades and can’t seem to stop. Does this mean I have a lack of faith? What does “help my unbelief” mean in Mark 24?