I think it is very very sad that you think these things about the cloistered life.
Cloistered religious life is the oldest form of religious life and has been treasured for centuries. Many, if not most of the saints were cloistered away for most of their lives. This sort of cloistered religious life goes back to even the Old Testament! Moses was cloistered away and was considered so holy that his face would glow with the magnificence God would leave behind. Even Jesus was cloistered away in the desert for 40 days. Why? In order to prepare Himself for His public ministry. Cloistered religious do it in order to prepare for Heaven.
The Desert Fathers were the original religious (if I’m correct) and marked this way of living in history. They knew that the world is your enemy. The world has nothing to offer. But you can offer the world something: prayer.
As Jesus told St. Faustina,
“My daughter, I want to instruct you on how you are to rescue souls through sacrifice and prayer. You will save more souls through prayer and suffering than will a missionary through his teachings and sermons alone. I want to see you as a sacrifice of living love, which only then carries weight before Me."
One desires to become cloistered in order to hear the voice of God because you cannot hear God in the busyness of this world. One also desires to become cloistered so that they can cultivate a perfect relationship with God, so that through prayer, God gives them peace and happiness being with Him. It is much easier to reach the last Interior Castle by being a cloistered religious, which is the Mystical Marriage.