Newbie needs help!

[As Zehn]

Don't know if I should be posting this here or in beginners forum. Loose aggressive 4/8 in Aruba (after flop you can bet 4 or 8).

I have Q2 in BB. Four players call and I check.
Flop is 4,2,2. I am first to bet with 8. It's raised and re-raised back to me, I call. Three players in pot.
Turn is 4. I check next player bets next player raises, I call.
River is J. I check, next player bets, last player calls, I call.

Other two players turn over 4's.

At what point should I have folded or played differently. All constructive comments appreciated.