I'm like this too, and I'm also a 5. This is not a bad thing, it's a process we take for development. I'm slowly getting to the point where I'm more myself in every situation and less like a mirror, but the mirror aspect will always be there to an extent.

There's a lot of positives to this, the obvious being that you can connect to anyone and make anyone feel good around you. With the extension of that being the ability to empathize and understand another's perspective but with a detached intellectualized lens (inherently so as you're not literally going through what they are), so you're able to guide and help them.

The other amazing ability from this way of being is that you can learn by "becoming" someone who is an expert. This is a much longer process and can be a bit weird to put into purposeful practice (or even notice you're doing this) because it goes against the norms but I think it's the best and easiest way to become extremely good at something (and it's a lot of fun).