Running bad stat check

[johndenver]

15,000 hands at 100NL
1.48 ptbb/100

vpip: 19.48
sb: 22
folded sb to steal: 82
folded bb to steal: 77
att to steal: 22
went to sd: 29.3
won $ at sd: 51
pf raise: 12.65

pf af: 1.53
flop af: 2.88
turn af: 1.88
river af: 1.23
total af: 1.79

I think my aggression is way below standard.. any tips on how to fix that.. i pretty much never fire the 2nd barrel with air, is that how ya'll get your turn aggressions so high?