You're getting some bad advice so far in this thread.
Yes, it will change everything about your life. Jesus said in Luke 9:23, "If anyone would come after me, let him deny himself and take up his cross daily and follow me." Being a Christian isn't about following rules - the reason Jesus died in the first place was because he knew you wouldn't be able to follow the rules - but it is about a daily journey of killing sin and becoming more like Christ. Paul said in Romans 6:11, "Even so consider yourselves to be dead to sin, but alive to God in Christ Jesus."
Being a Christian means you believe that Jesus is the son of God, and you believe that he took the punishment you deserved for all of the things you do wrong. Knowing that truth, you will not want to willfully sin, because doing so means you're grabbing a hammer and bashing the nails into the man who's being murdered on your account. Imagine your best friend, or your father, in the electric chair because of a crime you committed. He willingly put himself in that chair so you could live even though you committed the crime and he is innocent. Do you walk in and flip the switch and laugh while he dies looking you in the eyes? That would be insanity.
Flavel said it this way in the 1600s, through this fictitious conversation between Christ and God:
- God: “My son, here is a company of poor miserable souls, that have utterly undone themselves, and now lie open to my justice! Justice demands satisfaction for them, or will satisfy itself in the eternal ruin of them: What shall be done for these souls?”
- Christ: “O my Father, such is my love to, and pity for them, that rather than they shall perish eternally, I will be responsible for them as their Surety; bring in all thy bills, that I may see what they owe thee; Lord, bring them all in, that there may be no after-reckonings with them; at my hand shalt thou require it. I will rather choose to suffer thy wrath than they should suffer it: upon me, my Father, upon me be all their debt.”
- God: “But, my Son, if thou undertake for them, thou must reckon to pay the last mite, expect no abatements; if I spare them, I will not spare thee.”
- Christ: “Content, Father, let it be so; charge it all upon me, I am able to discharge it: and though it prove a kind of undoing to me, though it impoverish all my riches, empty all my treasures, yet I am content to undertake it.”
You deserved death and Christ took it on your behalf. You (and everyone for that matter) were created to worship him because (1) He's owed that because he is God and even beyond that, (2) He took on the form of man and subjected himself to torture and death because he loves you and wanted you to avoid the eternal punishment you rightly and justly deserve - not only for all the bad things you've done, but also for the fact that you're not worshiping him every second of every day, like he deserves.
Being a Christian means you'll spend the rest of your life trying to worship him, and be more like him. This means reading the Bible, praying, and doing whatever you can to become more like Jesus and to worship God. Not because you're supposed to, but because you want to. And if you believe that Jesus took your place on that cross, then you'll want to. And when you screw up - and you will every day - you can rest assured that your debts have already been paid. You'll pick your cross back up, and redouble your efforts to do better for the man who paid those debts and the God that sent him to do it.