stupid stupid stupid

Very disappointed.
I played for 2 hours, and then finished 9th, when 7th got 350$ and top 6 a ticket to a 500$ big online satellite. I made a mistake, when I called an all in from the BB, the SB put all his chips in, and I just called with AQ suited, because I thought we were down to 8 players, and only 1 to go. So I lost half of my stack against his KK. And I knew he was a conservative player, and I still don't think about what others might have. I'm a total bullshit to poker. I'm wasting my time. I should quit and do something better, like learning or cycling etc.