Yes, like the title suggests - one must be Thick SKin!
If you don't have it yet, well grow some!

I must really try not to take everything personally.

aKa  must be thick skin!

Arrghh, who cares what people think, who cares what people say, who cares what they feel!
I must build thick tall walls to block this all out.

Must must must...

M.U.S.T

Be...


Thick...


SKIN!