How do you describe yourself?

I took a MBTI personality test in March to understand my personality type in March.
The result showed that I was in the group of ISTJ, the most common type in Korean people.
People have two faces. But they feel more natural to one side. I couldn't understand why I had felt so tired after I enjoyed gathering with people. I like social gathering during the daytime. But I feel like taking some rest alone in the evening and at nigt. Before the test, I tried to avoid my being alone because I was worried that others might misunserstand me. Now I come to understand I need the time to be alone to recharge my energy. I spend all of my energy when I hang out with people. I definitely have to have my time to get my energy again. Some extroverted people are contrary to me. They get a lot energy when they are with people. That' s why they are so active and energetic with people and seem never tired after a long social gathering.
Do you think you know yourself well enough?
How do you describe yourself?