Chameleon
.You are a chameleon, i.e. very changeable—shifting according to the opinions of others, as the chameleon changes its hue to that of contiguous objects.
“As the chameleon, who is known
To have no colours of its own,
But borrows from his neighbour’s hue,
Cʹest un cameleon. One who shifts his opinions according to circumstances; a vicar of Bray.