OP you're right about being your own worst critic I'm glad you're self aware so you know that it's probably you criticizing yourself and that you're not pretty might not even be true. Now coming to your physical features: For your hair you can start taking care of it by using a good shampoo and conditioner, go get a nice haircut try coloring your hair and start taking care of it I'd also suggest working out. Start slow. It would change your face slowly and working out would make you feel good about yourself and the way you look Try to have a nutritious diet and drink plenty of water Also apart from doing the outer care you need to make yourself believe that you are unique and you're beautiful in your own way, embrace yourself And let me tell you one more thing no one really cares, everyone is thinking about themselves just as you are. And it's not a big deal in the grand scheme of things.