Why am i afraid to play aggressively in $1/2 NL 6max?

[AA Suited]

Let me preface this with the fact that i'm a $60 SnG player on stars.

The only time i've played cash games were to clear bonuses at PArty. that was 10player fullring. i dont remember the stakes, but all i was doing was bear hunting. (ie: set miner)

now for the stars 10B hand bonus, i'm trying to 12table 6max.

i'm at 30% vpip/20% PRF at .50/1 NL 6max.

in fact i'm having a ball donking it up and raising with garbage in co/button. if i get stacked, i rebuy w/o a 2nd thought. and I'm up like 12BB/100 so far. (yeah, i'm running hot.)

i call check raises with middle pair, i float pocket pairs, i 3bet push with nut flush draw, etc. in other words i have NO problem risking my $100 stack. bankroll= 5000BB

today, i tried 2tabling 1/2 NL 6max since the 10B hand bonus gives a higher bonus for medium stakes than low stackes. (and even smaller bonus for micro.)

i found myself unable to make the same fearless plays as on .50/1.

at 1/2, bankroll = 2500BB.

so why am i so concerned about losing my $200 stack at 1/2? and more importantly, how do i overcome it? [img]/images/graemlins/confused.gif[/img]