You need pain to learn, understand and all the rest.
Also, if you could not feel pain, and yet were mortal, you would not be mortal for very long. There are medical conditions that stop people from feeling pain, this is usually followed by bits of said human falling off due to cuts and infections they simply had not noticed.
Immortality, even painful immortality, would be beautiful. An unlimited time to read, learn, understand. As long as it was immortality without senility. Cause being immortal and senile would be SHIT. Think of all the places you could go as an immortal, all the things you could see, all the wisdom you could impart. You could set about reading all the great works of literature, study however many subjects you wish, become an expert in whatever fields you want.
*cough*
That was not meant to sound incredibly arrogant and pretentious, I just really value intelligence and knowledge over just about everything else. If I had the time, and the money, I would be a student for the rest of my gorram life.