I'm unable to fold TPTK

[theredpill5]

Lately, because of a string of bad beats or whatever. Not sure but now I'm unable to fold top pair top kicker.

I just got AK suited in MP. I raised to $2.50 . I got one caller.

Flop: 9 T A

pot = 8

I bet $6

LP guy raises to $12

I call.

Turn: T

I check
LP checks

River: X

I bet $5

He reraises all-in for $12

I call the $7

He shows AT full house.
I show how stupid I am.

How come I can't fold anymore ? I can't build bankroll if I can't fold. I estimate that my bankroll should probably be about +300 more than it is if I would be able to fold.

I guess I either always think that someone is making a move on me or I'm just afraid of being outplayed so much that I just call.