When playing Blackjack Online you need to have a clear head otherwise you will make bad decisions which result in your sinking further into the abyss. Forget about Blackjack strategy, if you are volatile at the table and not thinking straight you will go down in flames.
When you suffer a bad run that is the sign to stop and make a clean fist of it. Not to bury yourself deeper and deeper.
Feelings such as frustration, anger and fear are not going to help you at the table. In fact they will be counter-productive.
If after a few hands of busts you find yourself a bit disappointed and a red mist starts to descend over you maybe take a break from playing for a while. Go for a walk and get some fresh air.
Do whatever you can to stay calm and focused. Remember why you love playing the game in the first place.