Its a 58 player live £100 freezeout with 6 players left and here are the approximate stacks:

seat 1 -  65k
seat 2 -    89k
seat 3 -  65k
seat 4 -  23k - button
me      -   21k - small blind 2k
seat 6 -  20k - big blind     4k

prize structure is:
1st -       £2250
2nd-  £1250
3rd-  £750
4th-  £400
5th-  £350
6th-  £300

I have had virtually no premium hands, but portrayed a tight image only showing down 3 or so hands all tourney and have never been behind. I have only played 2 or 3 hands at the final table of 9. The assumption is that the remaining players are all competent.

Everyone folds round to me in the small blind and i have    .

I push him all in. Would you class this as a mistake/advocate different play?