Ask around at your local bike shop/randoms you run into when riding to find out where the racing group rides are. Racing is all about saving energy with drafting and "pack skills" (knowing how to ride in a group) are essential for success and more importantly keeping everyone safe. I don't care how strong you are, If you don't know how to ride in a group you'll get rekt by weaker riders.

goodluck bro. Hope you find a group.