What aspects of normal human behavior have people mistaken as the work of the flesh?

In Galatians 5, Paul helps us understand the work of the flesh, such as in verse 17: "For the desires of the flesh are against the Spirit, and the desires of the Spirit are against the flesh, for these are opposed to each other, to keep you from doing the things you want to do" (ESV). Also in vv. 19-21: "Now the works of the flesh are evident: sexual immorality, impurity, sensuality, idolatry, sorcery, enmity, strife, jealousy, fits of anger, rivalries, dissensions, divisions, envy, drunkenness, orgies, and things like these. I warn you, as I warned you before, that those who do such things will not inherit the kingdom of God" (ESV). The main identifier of the flesh seems to be in v. 17, as being against the Spirit. In what ways do we mistake normal weaknesses in our bodies and faculties as the flesh when they are not? What examples would help us know the difference, and perhaps not feel guilty and attempt wrong solutions for recovery?