If you're shy, you may be able to overcome it. Here are some ideas:
1. Focus on what you enjoy.
The excitement of excelling at something that you love can help you forget your nervousness about appearing publicly. In particular I've seen this happen with children who "forget themselves" as they get immersed in music, theater, or sports.
2. Address the problem directly.
For me, addressing the problem meant taking speech classes when I got to high school. I even reached the point where I could participate in speaking competitions. There are speaking programs, such as Toastmasters International, to help adults address the fear of public speaking.
3. Keep it in perspective.
It sounds weird – but what's the worst that could happen if you blew it? There's the possibility that you might be laughed at or humiliated, but the truth is that it's equally likely that others won't even notice your mistake. Our imagination about what could happen is usually worse than the reality of what does happen.
4. Start with something small.
If making a telephone cold call for your freelance business seems too daunting, try something easier first. Maybe you could make a customer service phone call to an established client who is satisfied with your work. After that success, the cold call may not seem as scary.
5. Remember on past successes.
Whether it is making a successful business presentation or successfully completing a cold call, remembering past successes can help inspire you to future success. These successes are "proof" that you can do it. If you succeeded in the past, then you can succeed again!
6. Don't be afraid to ask for additional help.
For whatever reason, sometimes the fear may be too great for you to overcome on your own. If you've tried everything and nothing seems to work, then don't be afraid to find professional help. There are therapists who specialize in helping people overcome phobias and social anxiety.
It's actually natural to be a little bit nervous about meeting new people, making cold calls, or giving a presentation. That nervousness doesn't have to keep you from succeeding, though.