The correct one is "Tú eres muy tímido", but you could say "Usted es muy tímido" (usted is a polite form of second person singular, like आप).
"Lo" is the direct object pronoun. It's like "it", but it can also be a personal pronoun.
Take it: cógelo
Take him: cógelo
I hope someone improves the explanation.![]()