Immortality would be awful. From the off you'd think along the lines of- yes! I can live forever, see everything, do as much as can be done and all that shit. But then, you wouldnt age with your family and friends, they would all grow old and change, and you would remain the same, unable to understand your own generation anymore, let alone the forward thinking ways of a new one, caught in a limbo between being old and young and part of neither forever. Then all the people you know and love would die around you. You'd soon discover that in having an eternal life everything would lose meaning- what would be the point in pursuing something with passion if it could be done tomorrow? or indeed what would be the point in pursuing it when you know it would eventually dissappear and cease to exist as society moves on from it? everyone you meet and would build a relationship with would eventually become another death, another person who couldnt be there for you when you needed them and eventually it would become too hard to even speak to people from the thought of them dying. You would become a lonely drifter, living forever on and on without meaning or purpose, wracked by the knowledge that everything you ever build, love, fight for, whatever will cease to exist before you ever will.
Wow... that would be really sad. Naawww....
Yeah, so anyway, its much better to just accept death however scary it is and get on with the baby making.