full glass?

is my glass full,
or can it actually hold more water?

someone once said my glass is not full,
it's just that i stop more water from going into it.

i wish to think that it can hold a lot more water,
instead of just one group.
i thought it was proven to me this year
that it can hold more water.
but was it selective?

if it is really full,
should i pour away the old water then?

what do i mean by this glass and water metaphor?
if you understand this (nice) song, you'll get what i mean.