Selfishness and Self-consciousness have a deep nexus. The more self-conscious you grow, the more selfish you become. People who are very self-conscious in social situations tend to have insecurities about themselves they have not resolved, a major one being their looks. Yes, looks aren’t everything, but they DO count.
You shouldn’t use the “looks aren’t everything” cop out to prevent you from at least doing all you can to make yourself feel good in your own skin