It's not just you. That's just the way it is. Consider what it was like before the creation of the ST class set. NOBODY could compete in any class without investing in autocross tires. When you get into serious competition, you have to have firm rules, and people will build/modify to those rules.

Casual folks like us like to do what we want to do to our car... and that's great. But don't expect to find an SCCA class that matches the things that you've chosen to do to your car.

If you truly want to compete, you need to study the rules and pick your class BEFORE you start modifying (or even before you purchase) a car to compete in.