I just switched from Stars NL25 to Full Tilt NL50. This is the very first orbit so absolutly nothing about them.

Full Tilt No-Limit Hold'em, $0.50 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($49.25)
Button ($59.05)
SB ($44.95)
Hero ($55.05)
UTG ($20.15)
UTG+1 ($50.10)
MP1 ($66.50)
MP2 ($25.80)
MP3 ($69.20)

Preflop: Hero is BB with 7, 9.
1 fold, MP1 calls $0.50, 1 fold, MP3 raises to $1.5, CO calls $1.50, 2 folds, Hero calls $1, MP1 calls $1.

Flop: ($6.25) 6, 9, T (5 players)
Hero checks, MP1 bets $2.5, MP3 raises to $13.75, CO folds, Hero raises to $53.55 (All-In), MP1 folds, MP3 folds.

Final Pot: $76.05

Short story ... I don't know what to do, so I push. No brainer or horrible?