I feel that way too a lot of the time. There is light at the end of the tunnel! It is sometimes hard for sometime to really appreciate an introverted person. I feel like the extroverts get all the credit sometimes. It is important to encourage yourself and know that you are awesome no matter how shy you are. Think of the thing that will or used to give you the most joy possible and go do it! if thats not possible, take a walk, and yes look into support groups. There are people in the world worth talking to, even though it always feels like there isnt.