Those who can, do. Those who can't, bully.
Being a non-confrontational person is the perfect target of a bully because you are the least likely person to fight back. I've delt with them at work myself and it's because of these that I have become a more assertive and even aggressive person when I have to be. We've even delt with the cyberbullies here for long time, but thanks to our great mods, co-administrators and the tightening of the terms of service, it's no longer tolerated here. It's interesting to hear some of the backgrounds of these bullies. Some were abused physically, verbally, mentally, sexually or have seen their parents being verbally/physically abused. Being a bully is one way they get control over others. They are basically weak and have the emotional developement of a 5 y/o.
Here's a good website to help get you through this ordeal.
www.bullyonline.org
Good luck to you