I wouldn't say that your chart looks terribly extroverted-- but I don't quite get a crippling anxiety disorder from it either.
When in doubt, it's always a good idea to look at the tightest hard aspect in a horoscope, as indicating the key issues with which the person will have to cope. Yours appears to be Venus opposite Neptune and Uranus. They're in the 12th house of hidden enemies (the people who gossip about you behind your back, vs. the open enemies you know about.)
Since Venus in a woman's chart symbolizes her femininity, I wonder if there is some issue for you here. Sometimes girls are made to feel that their bodies mature too quickly or too slowly, or that they are supposed to fit a certain model of girly looks, which they just can't muster. Some girls mature knowing they are gay, yet feel they cannot legitimately express this side of their personalities. With Aquarius rising and Saturn in the first house, you may feel that you look different from the others, and that this is a source of anxiety for you.
Is your fundamental fear that other people will talk about you disrespectfully behind your back?
Then you have this deep, caring Cancer moon-Mercury, with very little fire and air in your chart. You process the world through your feelings and a sense of life as basically material. How you think is how you feel emotionally. This makes it hard for you to intellectualize your way out of a problem, or to budge from your comfort zone through taking the initiative in a new direction.
Saturn square sun can give you a long term struggle with your self-esteem, yet Saturn also responds well to rigorous self-discipline. See if a rigorous exercise program helps: many people report that it enhances their self-confidence.
Like Kimberley, I wonder what is the role of your parent/s or early childhood conditioning in your dilemma. Also, have you met with a psychologist to discuss your issues? You might find it therapeutic. Your family doctor (or walk-in clinic MD) can give you a referral.
Please realize that there is nothing astrologically wrong with you, but that you do show a propensity to be very hard on yourself, notwithstanding.