Aggressive play or Donkey play?

I have been watching Poker Training Videos and am trying to be more aggressive in my play. There is a fine line between being aggressive and being a donkey and I think I may have crossed it with this hand.

Full Tilt Poker, $0.10/$0.25 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

CO: $35.05
BTN: $24.95
SB: $10.50
LZFSB3 (BB): $17.95
UTG: $25
MP: $49

Pre-Flop: J A dealt to LZFSB3 (BB)
UTG folds, MP raises to $0.50, 2 folds, SB calls $0.40, Hero raises to $2, MP calls $1.50, SB calls $1.50

Flop: ($6) 9 8 T (3 Players)
SB bets $3, LZFSB3 calls $3, MP raises to $18, SB calls $5.50 and is All-In, LZFSB3 calls $12.95 and is All-In

Turn: ($46.40) Q (3 Players - 1 is All-In)

River: ($46.40) 5 (3 Players - 1 is All-In)

Results: $46.40 Pot ($2.30 Rake)
SB showed T 9 (two pair, Tens and Nines) and LOST (-$10.50 NET)
LZFSB3 showed J A (a straight, Queen high) and LOST (-$17.95 NET)
MP showed K A (a flush, Ace high) and WON $44.10 (+$26.15 NET)