As a serf in a feudal society, my life would be very difficult. I would be bound to the land and would have to work hard every day to provide for my lord. I would have no freedom to choose my occupation or to leave the land. My life would be filled with hard work, poverty, and uncertainty.
My relationship with the other two groups, the lords and vassals, would be one of subservience and dependence. I would have to work for my lord and provide him with a portion of my crops and livestock. In return, he would provide me with protection and a place to live.
The vassals would be responsible for providing military service to the lord and would receive land in return. They would be higher in the social hierarchy than me, but still subservient to the lord.
Overall, I would say that feudalism is a bad system for the serfs. While it provided some protection and security, it also limited my freedom and opportunities.
The lords and vassals benefited the most from the system, while the serfs had to work hard and live in poverty. The disadvantages of feudalism outweighed the advantages, and I would have preferred to live in a society with more freedom and opportunities.