Is it typical for an INFP to carry a low mood?

Yes, it is typical for an INFP to carry a low mood. INFPs are highly sensitive to their environments and can become overwhelmed easily. They often have a perfectionist streak which leads them to be hard on themselves and view themselves as failures. This can result in a chronic low mood. Additionally, INFPs are introverts who need plenty of time alone to restore their energy, and because they tend to avoid conflict, they may not get the social support they need which can compound their feelings of isolation and sadness.