Godseeker1, you sound like someone who is sincerely seeking honest answers to your dilemna of whether or not to believe in God and become a Christian. For that I applaud you. Let me assure you that God does not want us to "check our brains at the door" when we try to come to Him and understand. Never be afraid to ask questions. I've always said that there are no stupid questions, only stupid answers. None of us Christians were born followers of Jesus, we were all born in original sin and were enemies of God, if you will. We all had to make our journey home to Him, along our own paths. But I can also assure you that God will reveal Himself to you, if you keep seeking Him. These response posts by fellow Christians here are a way that God is revealing Himself to you, and is calling you to be one of His children. That being said, let me now try to address, specifically, some of the points you brought up.
First, let me say that we do have free will. However God, who is outside of time and space, can see everything, the past, present, and future. Thus, He could know, before the foundation of the earth, that you were going to write this thread exactly when you did, without violating your free will. That is also how He is able to know and reveal to us, beforehand, His prophesies and how they will be fulfilled. The reason He gave us free will is, as others have said before me, because He loves us so much that He does not wish to force His will upon us, but wants us to come to Him and love Him freely. Without this freedom, we would be, as you mentioned in your post, mere puppets.
With free will, we can choose to love and follow God. However we can also choose to remain in our sins, continuing to serve ouselves and being slaves to evil. This is the other side of the coin, if you will, to free will. It is the reason that God "allows" so much evil in the world. If God did not allow this evil, then free will really wouldn't be free will, if you think about it. God would stop every bad decision we made, that was contrary to Him, Who is goodness itself. Thus He would become a puppetmaster, with us on His strings. We were made in His image, and are given the choice to choose Him or ourselves, but there are consequences either way. To choose God leads to heaven, but it also entails sacrifice and suffering for God's sake and the sake of the kingdom of heaven. To choose evil and one's own will leads to hell, but it can be quite alluring with all the "seemingly" great things the world has to offer. This leads us to another important point. God has made entry into heaven difficult, as the Bible says:
Matthew 7:13 "Enter through the narrow gate; for the gate is wide and the road broad that leads to destruction, and those who enter through it are many.
Matthew 7:14 How narrow the gate and constricted the road that leads to life. And those who find it are few.
This shows us that being a follower of Jesus is not going to be easy, but it is worth it in the long run. We either suffer here, for a little while, or we suffer later, in hell, for eternity. Plus, by suffering here we can help reunite God with others and also build up treasures for ourselves in heaven (which should never be our primary focus but it does help to motivate us at times).
Also, the fact that Christianity is a hard road at times shows us that God really wants to see where we stand. If it was easy, especially if it was easier than being selfish, then everyone would do it. The fact that it is difficult makes it important and special when we actually do choose God over ourselves and sin. We are sacrificing for God's sake and for others out of love for God, and that shows that we are truly followers of Christ.
Second, God wants you to be yourself, in certain areas, but He also wants you to change. Let me explain. He created you the way you are for His good purpose and pleasure. No one in the kingdom of God can do exactly what He created you to do. You're not just some number along the history of humanity's existence, you're a very special and unique creation of the Lord Almighty. He really did "break the mold" when He made you, just as He did with all of us. And He wants your cooperation in furthering His kingdom and His will here on earth. God can do anything, because He is God, but He still wants to include you in His plans. He wants you to be "His hands and feet" while you're here on earth. That's why we are still left here on earth after we become Christians, because we still have work to do for His sake.
That being said, He does want you to change from your state of being born into origianl sin. Our original parents, Adam and Eve, were responsible for this when they disobeyed God and ate of the apple in the Garden of Eden. From then on, all of mankind was born into original sin and was destined for hell. However, God, out of His infinite love for us, came up with a way for mankind to be redeemed from the punishment of hell. He sent His Son Jesus Christ to die on the cross, taking all of our sins upon Himself. We cannot save ourselves, we need God's unmerited grace and favor in order to be saved from the fires of hell. This is where God wants you to change, for your own good. We can all see how evil the world is, as well as the individuals in it. There is sin everywhere and in everyone, even in ourselves, if we are honest about it. Seeing this, we can understand why Christ's death on the cross was the only way mankind could be redeemed. However, going back to free will, it is still left up to us whether or not we accept God's forgiveness and grace. God will not force it on anyone, we have to choose to accept it or reject it.
(Continued in next post)