I felt like he may c-bet with weak 66-88, AQ, AK but that turn c-bet scared me off, so my question is when I should fold this kind of weak overpairs and when I shouldn't.

PokerStars - $0.02 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

BTN: 222.5 BB (VPIP: 25.35, PFR: 21.13, 3Bet Preflop: 0.00, Hands: 75)
SB: 93.5 BB (VPIP: 18.40, PFR: 13.74, 3Bet Preflop: 2.53, Hands: 219)
BB: 100 BB (VPIP: 27.78, PFR: 23.33, 3Bet Preflop: 5.88, Hands: 92)
UTG: 100 BB (VPIP: 22.22, PFR: 22.22, 3Bet Preflop: 0.00, Hands: 9)
Hero (MP): 121 BB
CO: 127 BB (VPIP: 12.26, PFR: 10.32, 3Bet Preflop: 3.39, Hands: 158)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has T T

UTG raises to 3 BB, Hero calls 3 BB, fold, fold, fold, BB calls 2 BB

Flop: (9.5 BB, 3 players) 9 5 2
BB checks, UTG bets 5.5 BB, Hero calls 5.5 BB, fold

Turn: (20.5 BB, 2 players) 6
UTG bets 13 BB, fold

UTG wins 20 BB

Call

I think this fold is close, but i dont mind folding here, agasint a valuerange we are crushed even including 77,88.
So folding dont loose money here, just that simple, difficult to say if he bets with overcards on this turn at all or sometimes, if not, its a fold, if yes, its a thin call.
If you think he only bets with top pair,77-88, overpairs and gutshots,str8, sets your equity is 29% according to flopzilla even including 77,88 and you can discount some of this.

And because they dont doublebarrelbluff on this board you can make a good fold here i think.
Just many sets and better overpairs, only very few 9 Top pairs.
No FD
Like it.
If he bets sometimes with AK here, its more close but think about what he is thinking you have after the flopcall, would he cbet OC here with all theese possible sets and str8 ?
This spot seems a standard call but you have to look really deep into ranges here.
Against a loose fish who plays like Q9,J9o its a call, close but think folding is fine, even with overpair because you have narrow his range very much here after two bets.

But its close, if he only doublebarrel some AK here, its a call, depends on that.

I'm probably calling the turn. I think river would be an easier fold to a 3rd barrel.

QQ is a snap 3b in this player pool. It just seems ridiculous if OP is only continuing with 99 and JJ ott, nor should hero have baby sets either.