If there is anything I can give advice on, it's passion. Follow it, go after it, do it. When your 70, do you want to ask yourself "what if?".
Stop being scared. Get out of hiding. You know what you're best at, so go for it. You know that's what you want and should be doing. It will reflect in every aspect of your life.
Passion is what has led me to every success. If you're not excited about something, if you're not willing to be flexible to move forward, if you don't take chances, meet new people, and basically fret... you need to change. Never say never. The "impossible" in many people's minds has been proven possible over and over throughout history. Help yourself now. Get started.
A couple great quotes I've come across recently:
"There art two cardinal sins from which all others spring: Impatience and Laziness."
~ Franz Kafka
“Babe Ruth struck out more than anyone in the history of baseball the year that he hit 60 home runs. Do you want to hit home runs? You’d better be willing to strike out a lot.”
~ Wayne Dyer
You ready to strike out a few times? Your home run is just around the corner.