I've recently been blocked by this site and it pains me to know that I'm going to spend eternity without Christ, if he's real. How do you all change so much? I always feel overpowered by even the exhaustion of considering all of the things I have to give up. IE. Cigarettes, inappropriate contentography, cursing, and on and on. If I want to consider Christianity to be the one true chance of moral satisfaction and true justice, I need to see more believers. It's hard to believe in a faith that seems to be filled with people that aren't just fallen sinners, but proud of it. It's like Christianity is just a suit they wear to feel blessed and have all the answers. It's pretty much just is a coping mechanism for so many "Christians" to keep their sanity when dealing with death. It's like they don't even believe.. I'm here because you're all obviously not a hindrance to the faith like so many. When you considered Christ or knew Christ, what did you do? I think I'm 95% sure this is true.
I don't think that being blocked by this site automatically means you're not going to Heaven. There are many passages in the New Testament about putting off the old man and putting on the new man.
http://bible.knowing-jesus.com/topics/The-New-Man-In-Christ
http://bible.knowing-jesus.com/topics/Putting-Off-The-Old-Man
I think changing takes effort, but also help from God. Praying for God to help you change helps. It says in the Bible that all have fallen short of the glory of God, Romans 3:22-24, including Christians, which means the only perfect Christian was Jesus Christ 1 John 3:5. You should look to him for your example. I think that faith saves people through grace, which is a gift from God Ephesians 2:8-10, but the Bible also says that faith without works is dead James 2:17, which I take to mean that your faith will effect your deeds. You can't keep succumbing to your sinful nature without trying to change and without repentance. Everyone needs to repent, or else we will all perish Luke 13:3. I can't tell you about joy because I am a very depressed person, but, I think for many people, that having hope in and trusting in Jesus and in salvation gives them joy 1 Peter 1:8-9, Romans 15:13. I struggle with trust issues in God, so maybe that is why I don't feel joy. Romans 1:32 also talks about how there are some that not only sin, but approve of sin and encourage others to do the same, and the title of that passage is God's wrath on unrighteousness, which I presume to meant that God doesn't like it when people not only sin but give approval to those that do. Christians are supposed to repent, not give approval to sin.
Romans 1:28-32
God’s Wrath on Unrighteousness
28And since they did not see fit to acknowledge God, God gave them up to a debased mind to do what ought not to be done.
29They were filled with all manner of unrighteousness, evil, covetousness, malice. They are full of envy, murder, strife, deceit, maliciousness. They are gossips,
30slanderers, haters of God, insolent, haughty, boastful, inventors of evil, disobedient to parents,
31foolish, faithless, heartless, ruthless.
32Though they know God’s righteous decree that those who practice such things deserve to die, they not only do them but give approval to those who practice them.
I'm not a good example of a Christian, so I'm not really one to talk, honestly, but I feel that the scripture I'm quoting gives an answer to your questions and concerns, even if my actions probably wouldn't. I've tried to be a better Christian the past four years now or so, and my brother agrees that I have changed since my teenage years for the better. I think it is possible to change, although I admit I still curse as well. Honestly I personally think that the only way to change for the better is if God changes you on the inside, and then eventually with some also additional effort on your part you try to change as well. Even if you keep sinning it is important to keep repenting. I think ultimately God will judge the heart at Judgement Day, and all secrets will be revealed.