Are you able to list everything that you're afraid of? Often, fear is a substantial ingredient for being shy. Are you able to face any of your fears? I, myself, had been afraid of heights. I used psychology of martial arts to solidify myself in the here and now, and walked on the thin part of 2 x 4s 20 feet up. After an hour of doing this I came to the realization that all there is is the path in front of me. I haven't fallen yet, so I need not decide to be afraid of falling since I had proven it to myself already.
The reality of being shy is that you most often allow you mind to process the information you may feel the need to comment on. Far too often, people do not allow themselves to do that, and wind up blathering like an idiot. When some moron says that I'm an idiot I list every reference for them to verify for themselves; which usually shuts them up. And I always tell people to look things up through GOOD, verifiable resources.
If your mother or father were shy (as most men became, during the equal rights movement) the classical conditioning of example is at play here. Were either shy? If they embraced you in your childhood it might also be that classical conditioning.
Being shy is not a bad thing, until it feels like you might be collapsing in on yourself. Does it feel like you have way too many conscious thoughts all at once? When that happens for me, taking a walk, practicing karate, finding something to solidify me in the here and now works best for me, but may not for others.
I hope this is helpful for you. If you can find the name of a reliable on-line source for accurate psychology data, please use it, know about it, and apply what you can to yourself; but please know all options before you leap. Otherwise you'll wind up coming back to the same spot you're in, over and over, until you apply the things that you didn't learn yet.
Success to you.
Normandale Community Collge, in Bloomington MN, has a vast database of psychology abstracts, which can verify my answers.