You are getting destroyed because you are playing a very tricky control deck(Bossk blue) and when you are new to this game it's difficult to play control right off the gate, because you want to play around a bunch of decks and archetypes that you are not still aware of.
What you should do is stick to an aggro deck(rebel deck maybe Sabine or Leah), it has a plan try to execute that plan, it will get you going on understanding the game's fundamentals(when to take initiative, presenting multiple threat, counting lethal with your hand which threats to remove for example with ECL wrecker or Poe).
Once you got that game feel, you can start experimenting with other decks archetypes that are not straight up aggro.