Is "i squint at the wall of hearts on the other side of the room" a personifaction?

No its not. A personification is when you make an inanimate object and give it human like quality like, foe example " the cake was begging me to eat it" the cake cant talk but it was "Begging"

roses are red,

violets are black,

for what you said,

i hope you sit on a big fat tack.

im sure you mean write *