I don't believe this is the answer you're looking for but i think it fits
a skin cell
You are so accustomed to my presence
that you often won't become aware of my absence.
we shed skin all the the time without noticing the majority of the time
Behold my clan, some proud, some meek,
some skin is healthy, some is damaged by sun or tanning beds
all together one next to the other
and yet no trace of me.
your skin cells are next to each other but you can't see any individual one
Our encounters are usually just a squeeze,
if you're touching any other part of yourself, your skin is making contact with another piece of skin, squeezing it together
got lucky though and dodged every attempt to capture me.
ALL dead skin doesn't always come off when showering or for women exfoliating