Adobe After Effects - Masking Help/Problem!?

Question

I will try and explain this clearly...
I am making a jump effect, so I am making myself jump.
I masked myself, clicked in the transform tab "rotation" and "position"
and then I moved myself up into the sky. Except, it didn't look right, because the size was too big when I made . So I tried clicking on each keyframe I had made, selected the mask, and made it smaller. Except, instead of changing the size on each keyframe, it just changes the size of the mask altogether! So if I go back to the beginning of the scene, the mask is too small, I take it to the original size again, but the size is then too big for when I fly into the sky.
So each keyframe I have made (of me jumping higher into the sky), I want the mask to get smaller.
Thanks
P.S. Please don't mention rotoscoping, its not what I'm after for. I just want to decrease the size of my mask, in each keyframe, so every keyframe the mask gets a little bit smaller.

Answer 1

> Please don't mention rotoscoping, its not what I'm after for. I just
want to decrease the size of my mask, in each keyframe, so every
keyframe the mask gets a little bit smaller.
Despite what you said, I'm going to mention rotoscoping. The basic skills of rotoscoping involve knowing how to change and animate the shapes of masks, so the question that you're asking is best answered by pointing you to instructions that apply to rotoscoping.
If you want to scale and transform an entire mask, but have the change only apply to one keyframe, make sure that just one Mask Path keyframe is selected, and then free-transform the whole mask path.