If you risk 2% per trade it would take 35 consecutive losers with no winners to reduce your account by half.
This is (should be) very unlikely. Though its hard to trade back to the starting amount from 50%, its not impossible, and if you have to back out of trading at this point, that 50% of your account will pay some bills hopefully.
Even if the worst happened, and then happened again, so you had 70 consecutive losing trades and no winners, you would still have about a quarter of your account left. Bad, but not a wipe-out.