The maths say hit.
The maths also say don't play blackjak.
I hate doing the wrong thing as it can mess the cards up for the rest of the table.
Never worry about this, taking the wrong card could also sort the table out. It's just that no-one will notice when this happens.
Heard a great blackjack story once. How's this for messing up a table?
In an Aberdeen casino £1 minimum/£100 maximum blackjack table on a Friday night 5 crazy gamblers of mostly asian origin and my pal were at the table. The 5 asains had large bets ranging from £50 to £100 on about 6 boxes. My pal was in the anchor seat and betting £1 every hand, trying to chat up the dealer in the process.
The dealer was showing a

, our hero in the anchor seat had

. With the big bets in the other boxes there was a barrage of splitting, double-downing etc and loads of chips went on the table. They all finished with 17 or 18 totals.
My pals turn with his 9 total. "Stick" he says "I'll let you have the picture"
"WHAT!" said the table "You can't do that"
"Is that even allowed?"
"You have to take a card on a 9" etc
"It's my £1, I can do what I like" says my pal. "I want the lovely lady here to get the picture"
A floorman is called over and rules that if the player who bet the £1 wants to stick on a nine then he can stick on nine. He does so, dealer draws a

to make 19 and the house wins all the bets.
All hell breaks loose. Every player leaves the table in disgust, apart from our hero who bets another £1 and continues his inane chatter to the young lady dealer, it doesn't last long as she has to be taken off the table in a giggle fit when the next two cards in the shoe turn out to be a

and an

.