You need a detailed psychological evaluation to help you. See a clinical psychologist now.

Hello Friend, Good that you are seeking a help here. You have the symptoms of stress and anxiety. Such emotional disturbance cause low esteem and lack of confidence in your thoughts. More over due to stress, your body heat gets imbalance and can cause skin related allergies. I believe you are experiencing the same now. In ayurveda terms if an effect due to pitta or excess fire energy in body. There are home remedies, lifestyle changes and few self therapies can help you overcome both mind and body discomforts. Feel free to reach out to me online through Practo app on a convenient time to discuss in detail to evaluate further and recommendation..

Though you admire your self in mirror, you lack self belief and hence feel shy in public, as you wonder what will others think of me. Speaking also creates the same doubt in your mind..... Just take a few sessions with a therapist who will assist you in increasing your self belief, you will do great in life.

You seems to be highly anxious which extroverts used to be.But at the other hand you need to streamline your energies for better performances.