I've been to a few different agility classes and I've found that everyone is usually really friendly and encouraging - you will start with small basic steps and build up confidence for you and your dog on each piece of equipment at a time, so don't worry you wont have to run around a whole course in front of 10 people waving your arms around and hoping your dog will know what your on about on the first day! Book yourself in and go along and you will find you had nothing to worry about! Plus at 9 months I should imagine you will be doing puppy agility, which means you will be working on the commands and foundations of agility, which probably wont require any running at all!

Go for it, and post again to let us know how you got on!