Our lives in the developed world tend to be limited by biology; an average of about 80 years in many countries. Pigs get slaughtered at about 6 months, well before the lifespan they could potentially live to.
> miserable
If you're feeling constantly miserable, then please get some mental health treatment.
> and pointless
Possibly, but we are free to try to find some meaning for ourselves in our lives. Farm animals merely exist to grow as fast as possible and be slaughtered for food. The only point to their existence is to be food.