I really dont know what the hell is wrong with Ae but when i have my corner pinned video that is on top of another video that is going to smash it when ever i do a complete masking it shrinks???? like i have stayed up 2 days straight and i cant figure this **** out please help
You've not provided enough information for us to know what your issue is. However, I'll bet if you precomp your video layer (moving all attributes into the new comp) and THEN try masking it in the main comp, you won't have a problem.
What? You answered your own question:
my corner pinned video that is on top of another video that is going to smash it when ever i do a complete masking it shrinks?
Pre-compose the corner pin and do the masking in the main comp.
Corner pin uses the entire frame. There's your problem. Precomposed later you're going to use for a corner and then stretch it, scale it, whatever it takes to get it to fill the frame then apply corner been to the precomp in your main comp.