Because the blinds go up relatively quickly, there are only a limited amount of hands
that you'll end up playing, so there is a huge element of luck getting good cards within that time. Knowing this a lot of people go all-in with any marginal hand and it's always a 50:50, although like you I seem to lose with the best odds
more often than not. However, I have managed to place in a few by seeing flops and trying to control the pot. Avoid all-ins unless AA or KK. In the big blind, you're out of position, but usually last to act preflop which gives you the best chance of controlling if you see a flop. Seeing a flop will change the odds, especially if you hit something.