NL10: TPTK - fold gegen Unknown?

[DeusDeorum]

PokerStars No-Limit Hold'em, $0.10 BB (6 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($6)
Button ($10.50)
SB ($12.35)
BB ($16.85)
Hero ($17.65)
MP ($8.55)

Preflop: Hero is UTG with A, J. CO posts a blind of $0.10.
Hero raises to $0.4, 1 fold, CO (poster) calls $0.30, 2 folds, BB calls $0.30.

Flop: ($1.25) 4, J, T (3 players)
BB checks, Hero bets $0.8, CO calls $0.80, BB raises to $2.8, Hero calls $2, CO folds.

Turn: ($7.65) 7 (2 players)
BB bets $13.65 (All-In), Hero folds.

Final Pot: $7.65

ich hab keine Ahnung gegen was ich hier laufe.
Fold oke? Oder instacall?