How to explain to others what it's like to be alone?

How to explain to others what it's like to be alone being an introvert?

In most cases after a while when I'm tired, for example from school, being with people is not rest for me, my social battery is dead. Then I get tired of being in contact with people. Then I dont want go out and have long conversations. Then I just need break.

(I dont wanna feel alone, I just wanna be alone)