Self-compassion. See here and here and links therein.

Self-compassion, as defined by Kristin Neff contains 3 main components: (1) Self-Kindness; (2) Common Humanity, i.e. recognizing that your troubles aren't that unique and that many people suffer/have suffered similar problems and (3) Mindfulness: mainly, seeing clearly and not-denying your current state as it is.

I think self-compassion based meditation has increased my happiness as I've always tended to be overly self-critical.