Is it normal to think you're ugly?
Yes—lots of people have moments when they feel unattractive, even if other people see them differently. It’s worth paying attention if the thought is constant or keeps you from living your life.
Yes, it’s common to look at yourself more critically than you’d look at anyone else. Stress, comparison, a bad photo, or just being in a rough mood can make “I feel unattractive today” turn into “I’m ugly.” That feeling can be convincing without being an objective fact.
If it’s an occasional thought, you’re in very ordinary company. If it’s taking up a lot of your day, making you avoid people or activities, or turning into relentless self-criticism, consider talking it through with someone you trust or a counselor. You don’t have to wait until it feels “serious enough” to get support.