start to NL

Hi,
Just started playing NL holdem. I've been very careful and I think I have had a good start. I bought Poker Office so I could keep a record of my progress. I have been playing at $25/$50/$100NL on party poker. I have 7830 hands in my database and I am winning at a rate of 7.01/100 hands. I have settled at $25 NL as I realised I don't have the bankroll for any higher (started with $100 now its up to $603) I am averaging saw flop of about 15% from all positions apart from the BB. I reckon thats very tight, but it is working although I'm getting pushed off hands because I don't bluff much. But when I have a decent hand there's always someone calling me.

Now my problem is the BB. I think I am seeing the flop way too much (52% of the time) looking at my Poker Office stats. I have lost $137 so far from the BB.
What's the deal playing from the BB? The way I see it, I would have been better off folding EVERY hand from the BB. Or is it a case of only playing AA/KK and folding everything else even though I know I'm being raised with nothing?