Hand Fixation

Okay, so I've been playing poker for about a month now and for someone of my little experience I don't think I do too badly. I'd say I'm a break even player at the moment, I mainly play SnG but sometimes join in on a ring game, and have cashed on a few freerolls.

The biggest leak in my game is getting fixated with my hand, especially when I have a really good flop, I just ignore the turn and river. Any advice on reading the table and realising hang on a minute I might have Two Pair with Top Kicker but there's a straight draw on the table.