It depends on the number of trials. You are likely to win the first hand (about 43% of the time) but as you play more hands you become more likely to lose because the odds are against you. You may get lucky for a little while, but the longer you play the luckier you will have to be in order to win. Once you lose several hands it will be very difficult to win it back, and the odds say that you are more likely to lose than to win.
You can find out your exact odds for any number of hands by using the binomial distribution formula. It will tell you what your chances of winning $X are after playing N hands of blackjack.
-Sonny-