People give me testimonials all of the time. I even have a section on my site "Spotlight" where I spotlight clients' successes.
If you're being asked for a testimonial it means that you've had success and benefited from working with the person/company. People who are reading the testimonial are impressed with your success, not judging you for needing help. They're reading the testimonial because they need help and want to know that this is a person/company that delivers.
As someone who receives testimonials all of the time, I can tell you, it's very appreciated. Instead of worrying about what others are thinking about you, focus on contributing to someone else.
For more tips and articles by top entertainment industry coach, The Greenlight Coach, visit www.theGreenlightCoachBlog.com