On Becoming Invisible

I think it's old age! It seems that unless I am driving a car in an unknown place(and getting lost), I seem to be invisible most of the time, and the older I get the less confidence I have to actually go out there and do things. Why is it I wonder?
There are days when I have to push myself out the door - to drive someone else's car, to navigate unknown Motorways and roads, to travel solo to an unknown city, to wander around as a tourist and yet I cannot sit around watching the box or just grow old indoors.
But honestly, some days I just wonder!