My first 2+2 post Missing bets

Dealt to rvo411 [Ah Ac]
Waldow: folds
jxxxxx: folds
tyrantp: folds
2HAILEY4: folds
rvo411: raises $5 to $10
TripleBarrel: folds
NWNewell: folds
mebadnodonut: raises $5 to $15
rvo411: calls $5

*** FLOP *** [5h 9c 4c]
mebadnodonut: bets $5
rvo411: raises $5 to $10
mebadnodonut: raises $5 to $15
rvo411: calls $5

*** TURN *** [5h 9c 4c] [7c]
mebadnodonut: bets $10
rvo411: raises $10 to $20
mebadnodonut: calls $10

*** RIVER *** [5h 9c 4c 7c] [8s]
mebadnodonut: checks
rvo411: bets $10
mebadnodonut: calls $10
*** SHOW DOWN ***
rvo411: shows [Ah Ac] (a pair of Aces)
Seat 10: mebadnodonut (big blind) mucked [Js Jh]

I have a bad habit of shutting down with big pocket pairs. It always seems that whenever I have a high pocket pair someone always has a set or higher pocket pair. In an attempt to be more aggressive but get paid off with a lower pocket pair, I allowed him to lead the pre-flop and flop. Any suggestions on what I could have done better?