PokerStars 3/6 Hold'em (9 handed)

Preflop: Hero is UTG+1 with , .
1 fold, Hero raises, 1 fold, MP2 =#A500AF(Jackass)/ calls, MP3 3-bets, 4 folds, Hero calls, MP2 =#A500AF(Jackass)/ calls.

Flop: (10.33 SB) , , (3 players)
Hero bets, Jackass raises, MP3 folds, Hero calls.

Turn: (7.16 BB) (2 players)
Hero bets, Jackass raises, Hero calls.

River: (11.16 BB) (2 players)
Hero bets, Jackass raises, Hero calls.

Final Pot: 15.16 BB

Results in white below:
Hero has 3h 3s (three of a kind, threes).
Jackass has Th Jh (straight, queen high).
Outcome: Jackass wins 15.16 BB.

I probably lose more money on this hand once I'm in on the flop. However, I would fold this hand UTG+1. Its too early of a position to play small pp's, especailly raising them.

After the flop, I'm 3 betting that turn and probably 3 bet on the turn which he would cap. Unless I pair on the river, I then check call as I would be finally convinced he had something.

That line doesn't make a lot of sense to me on the last two streets. If you think you're ahead you should be 3-betting the turn or check-raising the river. Why call the turn and then lead out?

I have no problem with your preflop play if the table was weak tight (and your image was tight).