Can't be held back? You must be a Gemini!
Yours is a Mutable Sign, as evidenced by your eternally changing interests, jobs, and perhaps relationships.
Mercury is your ruler, and "mercurial" describes your nature, and your moods can fall prey to this quality as well. Outgoing and vibrant one minute, you can be lost in your own thoughts the next.
Take care that you don't come across as surly with others if indeed you are just pondering the latest tidbit added to your encyclopedic knowledge. Enlist one Twin to keep watch over the other Twin and develop your self-awareness.