Would you like me to type slower, honey?
Okay, I'll try.
Because it is too late by state statute to challenge paternity; the ONLY way Chris can get on your birth certificate is if he adopts you as part of an adult adoption which would mean Mom & Steve are no longer your legal parents.
And Chris didn't have sex with your Mom?
What you want is not relevant. The LAW is relevant.
If you want to do away with Mom as well, go right ahead and see if Chris will do an adult adoption. That will make him your ONLY legal parent.
That's if it is even an option in the relevant state (it is not available in all states).
What IS it with ungrateful little brats this weekend? Is it a full moon or something?