Demi Lovato regrets being so “critical” of herself during her younger years. The 31-year-old star – who first found fame as a child – has revealed that she wishes she embraced “self-love” at a much earlier age. Asked what advice she would give her teenage self, Demi told PEOPLE: “What I would tell my teenage self is I would say don’t hold yourself to anybody else’s standards but your own. And if your own becomes too critical, then look within yourself and try to find that self-love. “I think it’s really important to find self-love no matter what age you are.” Demi has learned a lot about beaut…