What are signs that someone has really low self esteem?

There are many signs that someone has really low self esteem. Some of the signs may include:

• They often feel like they don't belong in the world. 

• They have a difficult time making friends. 

• They feel like they can't do anything right. 

• They feel like they're always wrong. 

• They constantly compare themselves to others and feel like they're not good enough.

• These types of people are absent minded and they don't know what they are actually doing. 

• Sometimes they Doubt on their own skills and make themselves comfortable.