So sorry you had to overhear that. Last thing you needed but don't let that stop you or control you. Keep going. The more you accept yourself, the more your inner peace and self-esteem will show on your face and in your eyes.
Whether you believe it or not, your insecurity shows on your face. When that receeds, the good stuff will start to show more.
Keep in mind what Susan said. Don't let what that girl said stop you. She didn't say she didn't want to talk to you, did she? She likes your personality. Hang on to that.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.