No read, first hand at table.

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

MP3 ($50.20)
CO ($17.30)
Button ($53.55)
SB ($29)
Hero ($50)
UTG ($51.20)
UTG+1 ($108.55)
MP1 ($69.40)
MP2 ($56.70)

Preflop: Hero is BB with , .
2 folds, MP1 raises to $1, 4 folds, SB calls $0.75, Hero calls $0.50.

Flop: ($3) , , (3 players)
SB checks, Hero bets $3, MP1 calls $3, SB folds.

Turn: ($9) (2 players)
Hero bets $6, MP1 raises to $20, Hero????

Should I have bet the turn at all? How to proceed?