Please help. immortality?

It's impossible. You may extend your lifespan by taking a sheltered course in life but that is not the right way to live. Why do you want to be immortal anyway? It may be fun at first but think of the long-time consequences: You get to see your loved ones die, see people and your environment change, and perhaps even get experimented on. Just the mental toll it will take on you would be enough to make anyone go mad.