Who am I? (2nd Edition)

Unwelcome and uninvited I burst on the scene
To fittingly coexist I’m not too keen

Many can’t tell am woman or man
Hard to convince I’m well and sane

Shy away from duties, that’s what I do
Yet claim for territory, even the loo

At 1st sign of pressure, I simply crumble
Speak with people, is when I mumble

Hand me downs is sure my style
But I reside with not much guile

One of all prove my only mate
My unsure future I leave to fate