Idiot 20-40 hand? Am I retarded? please tell me otherwise

[shoepolish]

20-40. Great Blue Heron, Port Perry. I am the only player under 20, the rest of the field being 40-60.. So I am viewed as a tight, straightforward, idiot college player.

Here is the hand.

Hero in BB with 7 [img]/images/graemlins/club.gif[/img]5 [img]/images/graemlins/heart.gif[/img]
6 limpers, SB completes, I knock.
Flop (8sb)
6 [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/diamond.gif[/img]8 [img]/images/graemlins/heart.gif[/img]

SB checks, mp+2 bets (absolute idiot), cutoff raises (tight, agressive), I think, and cold call. Initial bettor calls.
Turn (7BB)
Turn brings a 7 [img]/images/graemlins/spade.gif[/img] ............. 6 [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/diamond.gif[/img]8 [img]/images/graemlins/heart.gif[/img] 7 [img]/images/graemlins/spade.gif[/img]

I check, initial Mp+2 checks, cutoff bets, I check raise, Mp+2 folds, Cutoff calls.

River (11BB)
River brings an 8.. I bet out.. cutoff folds. I win uncontested.

2 questions.... How terrible was my cold call on the flop, and secondly, was the check raise on the turn the best option given the board, and my position..

Thanks!